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@article(baksalary2021moore,
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 year         = {2021},
 title        = {The Moore--Penrose inverse: a hundred years on a frontline of physics research},
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 year         = {2023},
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@article(puystjens1984moore,
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 title        = {EP morphisms},
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@article(robinson1987generalized,
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 title        = {Generalized inverses of morphisms with kernels},
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@article(puystjens1990symmetric,
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@article(selinger2007dagger,
 author       = {P. Selinger},
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@article(wang2017class,
 author       = {Z. Wang},
 year         = {2017},
 title        = {A class of Drazin inverses in rings},
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 volume       = {31},
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 pages        = {1781--1789},
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@article(wei2003representation,
 author       = {Y. Wei and S. Qiao},
 year         = {2003},
 title        = {{The representation and approximation of the Drazin inverse of a linear operator in Hilbert space}},
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@article(wu2014remarks,
 author       = {Z. Wu and S. Zhang and C. Zhu},
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