1. Baloudi, H., Jribi, A.: Holomorphically weyl-decomposably regular. Funct. Anal. Approx. Comput. 8(2), 13–22 (2016)
2. Cross, R.W.: Multivalued Linear Operators. Marcel Dekker, New York (1998)
3. El Bakkali, A., Tajmouati, A.: On holomorphically decomposable Fredholm spectrum and commuting Reisz perturbations. Int. J. Math. Anal. 5(18), 887–900 (2011)
4. Harte, R.: Inversibility and Singularity for Bounded Linear Operator. Marcel Dekker, New York (1987)
5. Harte, R.: Regular boundary elements. Proc. Am. Math. Soc. 99, 328–330 (1987)