no. 4
Upon the generalised inverse of a formal power series with vector valued coefficients
Compositio Mathematica, Tome 23 (1971) no. 4, pp. 453-460 
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     author = {Wynn, P.},
     title = {Upon the generalised inverse of a formal power series with vector valued coefficients},
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     year = {1971},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {23},
     number = {4},
     mrnumber = {306224},
     zbl = {0239.15003},
     language = {en},
     url = {https://www.numdam.org/item/CM_1971__23_4_453_0/}
}
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Wynn, P. Upon the generalised inverse of a formal power series with vector valued coefficients. Compositio Mathematica, Tome 23 (1971) no. 4, pp. 453-460. https://www.numdam.org/item/CM_1971__23_4_453_0/

P. Wynn [1] Upon the inverses of formal power series over certain algebras, Centre de Recherches Mathématiques de l'Université de Montréal, Rapport, Août 1970.

E.H. Moore [2] On the reciprocal of the general algebraic matrix, Bull. Amer. Math. Soc. 26 (1920) 394-395.

E.H. Moore [3] General Analysis, Mem. Amer. Math. Soc. 1 (1935). | Zbl | JFM

R. Penrose [4] A generalised inverse for matrices, Proc. Camb. Phil. Soc. 51 (1950) 406-413. | Zbl | MR

A. Korganoff Et M. Pavel-Parvu [5] Eléments de théorie des matrices carrees et rectangles en analyse numérique, Dunod, Paris (1967). | Zbl