1. Krasnosel’skii M. A. et al., Integral Operators in Spaces of Summable Functions [in Russian], Nauka, Moscow (1966).
2. Krasnosel’skii M. A. and Rutitskii Ya. B., Convex Functions and Orlicz Spaces [in Russian], Fizmatgiz, Moscow (1958).
3. Krasnosel’skii M. A. and Pokrovskii A. V., Systems with Hysteresis [in Russian], Nauka, Moscow (1983).
4. Appell J. and Zabrejko P. P., Nonlinear Superposition Operators, Cambridge Univ. Press, Cambridge (1990).
5. Vodop’yanov S. K. and Ukhlov A. D., “Superposition operators in Sobolev spaces,” Dokl. Ross. Akad. Nauk, 386, No.6, 730–734 (2002).