New additive results for the g-Drazin inverse

By N. González, Jerry J. Koliha. Proceedings of the Royal Society of Edinburgh. Section A Mathematics, 2004

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New additive results for the generalized Drazin inverse (2010, background): “(See [8].”
Additive Results for the Generalized Drazin Inverse in a Banach Algebra (2015, unknown): “(2) Proof First, if we assume that a ∈ Aqnil , by Theorem 2.”
A note on the representation for the Drazin inverse of 2×2 block matrices (2008, methodology): “In this paper, using an additive result for the Drazin inverese proved in [7], we derive formulae for the Drazin inverse of a 2 × 2 block matrix M = [ A B C D ] , under the conditions weaker than those in the papers [10,12,13,15].”
On the Drazin inverse of the sum of two operators and its application to operator matrices (2009, methodology): “Expressions of the Drazin inverse of the sum of two matrices under the weaker conditions AD B = AB D = 0 and (I − B B D)AB(I − A AD) = 0 were given in [4], and it was extended for elements in a Banach algebra in [6].”