@article(Brainerd1969,
 doi          = {10.1016/S0019-9958(69)90065-5},
)
@inproceedings(dremoevog22,
 doi          = {10.1007/978-3-031-07469-1_7},
)
@article(DroPecVog2005,
 doi          = {10.1007/s00224-004-1096-z},
)
@book(Eilenberg1974,
)
@article(gebnedvog17,
 doi          = {10.1162/COLI_a_00291},
)
@article(Goguen1977,
 doi          = {10.1145/321992.321997},
)
@incollection(jossch97,
 doi          = {10.1007/978-3-642-59126-6_2},
)
@book(kal10,
 doi          = {10.1007/978-3-642-14846-0},
)
@article(Karner1992,
 doi          = {10.1007/BF03025757},
)
@inproceedings(kuhnie2008,
 doi          = {10.1007/978-3-540-70590-1_15},
)
@article(Kuich1999,
)
@inproceedings(moevog2019,
 doi          = {10.18653/v1/W19-3108},
)
@article(moevog2021,
 doi          = {10.1016/j.ic.2021.104774},
)
@inproceedings(nedvog14,
 url          = {https://aclanthology.org/C14-1130},
)
@article(SekMatFujKas91,
 doi          = {10.1016/0304-3975(91)90374-B},
)
@book(wec92,
 doi          = {10.1007/978-3-642-76771-5_3},
)