1. Abdeljabbar, A., Tran, T. D.: Singular differential equations and g-Drazin invertible operators. Int. J. Anal., 2016, 7975107 (2016)
2. Barnes, B. A.: Common operator properties of the linear operators RS and SR. Proc. Amer. Math. Soc., 126, 1055–1061 (1998)
3. Ben-Israel, A., Greville, T. N. E.: Generalized Inverses: Theory and Applications, Second Ed., Wiley-Interscience New York, 1974, Springer, New York, 2002
4. Campbell, S. L., Meyer, C. D.: Generalized Inverses of Linear Transformations, Pitman, London, 1979
5. Campbell, S. L., Meyer, C. D., Rose, N. J.: Applications of the Drazin inverse to linear systems of differential equations with singular constant coefficients. SIAM J. Appl. Math., 31, 411–425 (1976)