Geodesic
Moore–Penrose inverse of bidiagonal matrices. IV
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 28-34.

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The present work completes a research started in the papers $[1-3]$. Based on the results obtained in the previous papers, here we give a definitive solution to the problem of the Moore–Penrose inversion of singular upper bidiagonal matrices.
Keywords: generalized inverse, Moore–Penrose inverse
Mots-clés : bidiagonal matrix. 
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Yu. R. Hakopian; S. S. Aleksanyan. Moore–Penrose inverse of  bidiagonal matrices. IV. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 28-34. http://geodesic.mathdoc.fr/item/UZERU_2016_2_a4/

[1] Yu. R. Akopian, S. S. Aleksanyan, “Moore–Penrose inverse of bidiagonal matrices. I”, Proceedings of the YSU, Physics $\$ Mathematics, 2015, no. 2, 11–20 | Zbl

[2] Yu. R. Akopian, S. S. Aleksanyan, “Moore–Penrose inverse of bidiagonal matrices. II”, Proceedings of the YSU, Physics $\$ Mathematics, 2015, no. 3, 8–16 | Zbl

[3] Yu. R. Hakopian, S. S. Aleksanyan, “Moore–Penrose inverse of bidiagonal matrices. III”, Proceedings of the YSU, Physics Mathematics, 2016, no. 1, 12–21