Representations of $\{3\}$, $\{4\}$, $\{1,3\}$, $\{1,4\}$ Inverses
Mathematica Moravica, Tome 1 (1997) no. 1.

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In this paper we obtain a general solution of the Penrose's equation (3), solution of the equation (4) and a general solution of the system of Penrose's equations (1),(3) and (1),(4). We also introduce a determinantal representation of the classes of $\{3\}$, $\{4\}$, $\{1,3\}$ and $\{1,4\}$-inverses of complex matrices. 
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     author = {Predrag Stanimirovi\'c and Miroslav Risti\'c},
     title = {Representations of $\{3\}$, $\{4\}$, $\{1,3\}$, $\{1,4\}$ {Inverses}},
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Predrag Stanimirović; Miroslav Ristić. Representations of $\{3\}$, $\{4\}$, $\{1,3\}$, $\{1,4\}$ Inverses. Mathematica Moravica, Tome 1 (1997) no. 1. https://geodesic-test.mathdoc.fr/item/MM3_1997_1_1_a13/