1. A. A. Boichuk, V. F. Zhuravlev, and A. M. Samoilenko, Normally Solvable Boundary-Value Problems [in Russian], Naukova Dumka, Kiev (2019).
2. A. A. Boichuk, V. F. Zhuravlev, and A. A. Pokutnyi, "Normally solvable operator equations in a Banach space," Ukr. Mat. Zh., 65, No. 2, 163-174 (2013)
3. English translation: Ukr. Math. J., 65, No. 2, 179-192 (2013).
4. A. A. Boichuk and A. M. Samoilenko, Generalized Inverse Operators and Fredholm Boundary-Value Problems, De Gruyter, Berlin (2016).
5. A. M. Samoilenko, A. A. Boichuk, and V. F. Zhuravlev, “Linear boundary value problems for normally solvable operator equations in a Banach space,” Different. Equat., 50, No. 3, 1–11 (2014).