@article(Cook78,
 author       = "C. R. Cook and P. S.-P. Wang",
 year         = "1978",
 title        = "A Chomsky hierarchy of isotonic array grammars and languages",
 journal      = "Computer Graphics and Image Processing",
 volume       = "8",
 pages        = "144--152",
 doi          = "10.1016/S0146-664X(78)80022-7",
)
@book(Csuhaj94,
 editor       = "E. Csuhaj-Varj\`{u} and J. Dassow and J. Kelemen and Gh. P\u {a}un",
 year         = "1994",
 title        = "{Grammar Systems. A Grammatical Approach to Distribution and Cooperation}",
 publisher    = "Gordon and Breach, London",
)
@book(DassowPaun1989,
 author       = "J. Dassow and {\relax Gh}. P\u {a}un",
 year         = "1989",
 title        = "{Regulated Rewriting in Formal Language Theory}",
 series       = "EATCS Monographs in Theoretical Computer Science",
 volume       = "18",
 publisher    = "Springer Berlin",
 doi          = "10.1007/978-3-642-74932-2",
)
@article(Ehrenfeucht95,
 author       = "A. Ehrenfeucht and A. Mateescu and Gh. P\u {a}un and G. Rozenberg and A. Salomaa",
 year         = "1996",
 title        = "{On representing RE languages by one-sided internal contextual languages}",
 journal      = "Acta Cybernetica",
 volume       = "12",
 number       = "3",
 pages        = "217--233",
 doi          = "10.1007/BF03036464",
)
@article(Ehrenfeucht96,
 author       = "A. Ehrenfeucht and Gh. P\u {a}un and G. Rozenberg",
 year         = "1996",
 title        = "{The linear landscape of external contextual languages}",
 journal      = "Acta Informatica",
 volume       = "35",
 number       = "6",
 pages        = "571--593",
 doi          = "10.1007/s002360050059",
)
@article(Ehrenfeucht98,
 author       = "A. Ehrenfeucht and Gh. P\u {a}un and G. Rozenberg",
 year         = "1998",
 title        = "{On representing recursively enumerable languages by internal contextual languages}",
 journal      = "Theoretical Computer Science",
 volume       = "205",
 number       = "1--2",
 pages        = "61--83",
 doi          = "10.1016/S0304-3975(97)00035-2",
)
@article(Fernauetal2005,
 author       = "H. Fernau and R. Freund and M. Holzer",
 year         = "2005",
 title        = "{Representations of recursively enumerable array languages by contextual array grammars}",
 journal      = "Fundamenta Informaticae",
 volume       = "64",
 pages        = "159--170",
)
@inproceedings(Freundetal2013,
 author       = "H. Fernau and R. Freund and S. Ivanov and M.\tmspace +\thinmuskip {.1667em} L. Schmid and K.\tmspace +\thinmuskip {.1667em} G. Subramanian",
 year         = "2013",
 title        = "{Array insertion and deletion P systems}",
 editor       = "G. Mauri and A. Dennunzio and L. Manzoni and A.\tmspace +\thinmuskip {.1667em} E. Porreca",
 booktitle    = "{UCNC 2013, Milan, Italy, July 1--5, 2013}",
 series       = "LNCS",
 volume       = "7956",
 publisher    = "Springer",
 pages        = "67--78",
 doi          = "10.1007/978-3-642-39074-6{\_}8",
)
@article(Fernauetal2013,
 author       = "H. Fernau and R. Freund and M.L. Schmid and K.G. Subramanian and P. Wiederhold",
 title        = "{Contextual array grammars and array P systems}",
 note         = "Submitted",
)
@incollection(Freund93,
 author       = "R. Freund",
 year         = "1994",
 title        = "{Control mechanisms on $\#$-context-free array grammars}",
 editor       = "Gh. P\u {a}un",
 booktitle    = "{Mathematical Aspects of Natural and Formal Languages}",
 publisher    = "World Scientific, Singapore",
 pages        = "97--137",
 doi          = "10.1142/9789814447133{\_}0006",
)
@incollection(Freundetal2011,
 author       = "R. Freund and M. Kogler and M. Oswald",
 year         = "2011",
 title        = "{A general framework for regulated rewriting based on the applicability of rules}",
 editor       = "J. Kelemen and A. Kelemenov{\'{a}}",
 booktitle    = "{Computation, Cooperation, and Life - Essays Dedicated to Gheorghe P\u {a}un on the Occasion of His 60th Birthday}",
 series       = "LNCS",
 volume       = "6610",
 publisher    = "Springer",
 pages        = "35--53",
 doi          = "10.1007/978-3-642-20000-7{\_}5",
)
@incollection(Freundetal2007,
 author       = "R. Freund and Gh. P\u {a}un and G. Rozenberg",
 year         = "2007",
 title        = "{Contextual array grammars}",
 editor       = "K.G. Subramanian and K. Rangarajan and M. Mukund",
 booktitle    = "{Formal Models, Languages and Applications}",
 series       = "Series in Machine Perception and Artificial Intelligence",
 volume       = "66",
 publisher    = "World Scientific",
 pages        = "112--136",
 doi          = "10.1142/9789812773036{\_}0008",
)
@inproceedings(Freundetal2012,
 author       = "R. Freund and Yu. Rogozhin and S. Verlan",
 year         = "2012",
 title        = "{P systems with minimal left and right insertion and deletion}",
 editor       = "J. Durand-Lose and N. Jonoska",
 booktitle    = "{Unconventional Computation and Natural Computation - 11th International Conference, UCNC 2012, Orl{\'{e}}ans, France, September 3-7}",
 series       = "LNCS",
 volume       = "7445",
 publisher    = "Springer",
 pages        = "82--93",
 doi          = "10.1007/978-3-642-32894-7{\_}9",
)
@article(Galiuk81,
 author       = "B. Galiukschov",
 year         = "1981",
 title        = "{Semicontextual grammars}",
 journal      = "Logica i Matem. Lingvistika",
 pages        = "38--50",
 note         = "In Russian",
)
@phdthesis(Haussler82,
 author       = "D. Haussler",
 year         = "1982",
 title        = "Insertion and Iterated Insertion as Operations on Formal Languages",
 type         = "Phd thesis",
)
@article(Haussler83,
 author       = "D. Haussler",
 year         = "1983",
 title        = "{Insertion languages}",
 journal      = "Information Sciences",
 volume       = "31",
 number       = "1",
 pages        = "77--89",
 doi          = "10.1016/0020-0255(83)90023-3",
)
@phdthesis(Kari,
 author       = "L. Kari",
 year         = "1991",
 title        = "On Insertion and Deletion in Formal Languages",
 type         = "Phd thesis",
)
@inproceedings(KPTY97,
 author       = "L. Kari and Gh. P\u {a}un and G. Thierrin and S. Yu",
 year         = "1997",
 title        = "{At the crossroads of {DNA} computing and formal languages: Characterizing {RE} using insertion-deletion systems}",
 booktitle    = "{Proc. of 3rd DIMACS Workshop on DNA Based Computing}",
 pages        = "318--333",
)
@incollection(Kamala2000,
 author       = "K. Krithivasan and M. S. Balan and R. Rama",
 year         = "2000",
 title        = "{Array Contextual Grammars}",
 editor       = "C. Martin-Vide and Gh. P\u {a}un",
 booktitle    = "{Recent Topics in Mathematical and Computational Linguistics}",
 pages        = "154--168",
)
@article(Marcus69,
 author       = "S. Marcus",
 year         = "1969",
 title        = "{Contextual grammars}",
 journal      = "Rev. Roum. Math. Pures Appl.",
 volume       = "14",
 pages        = "1525--1534",
)
@article(Post46,
 author       = "E. L. Post",
 year         = "1946",
 title        = "{A variant of a recursively unsolvable problem}",
 journal      = "Bull. Amer. Math. Soc.",
 volume       = "52",
 pages        = "264--268",
 doi          = "10.1090/S0002-9904-1946-08555-9",
)
@book(Paun97,
 author       = "Gh. P\u {a}un",
 year         = "1997",
 title        = "{Marcus Contextual Grammars}",
 publisher    = "Kluwer, Dordrecht",
 doi          = "10.1007/978-94-015-8969-7",
)
@book(pbook,
 author       = "Gh. P\u {a}un",
 year         = "2002",
 title        = "Membrane Computing. An Introduction",
 publisher    = "Springer",
 doi          = "10.1007/978-3-642-56196-2",
)
@article(Paun80,
 author       = "Gh. P\u {a}un and X. M. Nguyen",
 year         = "1980",
 title        = "{On the inner contextual grammars}",
 journal      = "Rev. Roum. Math. Pures Appl.",
 volume       = "25",
 pages        = "641--651",
)
@inproceedings(Paun94,
 author       = "{\relax Gh}. P\u {a}un and G. Rozenberg and A. Salomaa",
 year         = "1994",
 title        = "{Contextual grammars: erasing, determinism, one-sided contexts}",
 editor       = "G. Rozenberg and A. Salomaa",
 booktitle    = "{Developments in Language Theory}",
 publisher    = "World Scientific Publ., Singapore",
 pages        = "370--388",
)
@article(Paun95,
 author       = "{\relax Gh}. P\u {a}un and G. Rozenberg and A. Salomaa",
 year         = "1996",
 title        = "{Contextual grammars: parallelism and blocking of derivation}",
 journal      = "Fundamenta Informaticae",
 volume       = "25",
 pages        = "381--397",
 doi          = "10.3233/FI-1996-253410",
)
@book(phandbook,
 editor       = "{\relax Gh}. P\u {a}un and G. Rozenberg and A. Salomaa",
 year         = "2010",
 title        = "{The Oxford Handbook of Membrane Computing}",
 publisher    = "Oxford University Press",
)
@book(Rosenfeld79,
 editor       = "A. Rosenfeld",
 year         = "1979",
 title        = "{Picture Languages}",
 publisher    = "Academic Press, Reading, MA",
)
@book(handbook,
 editor       = "G. Rozenberg and A. Salomaa",
 year         = "1997",
 title        = "{Handbook of Formal Languages (3 volumes)}",
 publisher    = "Springer, Berlin",
)
@misc(ppage,
 author       = "{\relax The P Systems Website}",
 url          = "{http://ppage.psystems.eu}",
)
@article(Verlan2010,
 author       = "S. Verlan",
 year         = "2010",
 title        = "{Recent developments on insertion-deletion systems}",
 journal      = "Comp. Sci. J. of Moldova",
 volume       = "18",
 number       = "2",
 pages        = "210--245",
)
@phdthesis(VerlanH,
 author       = "S. Verlan",
 year         = "2010",
 title        = "Study of Language-theoretic Computational Paradigms Inspired by Biology",
 type         = "Habilitation thesis",
)
@article(Wang80,
 author       = "P. S.-P. Wang",
 year         = "1980",
 title        = "Some new results on isotonic array grammars",
 journal      = "Information Processing Letters",
 volume       = "10",
 pages        = "129--131",
 doi          = "10.1016/0020-0190(80)90063-0",
)