1. I. M. Isaryuk and I. D. Pukal’skii, “The boundary-value problems for parabolic equations with a nonlocal condition and degenerations,” Ukr. Mat. Visnyk, 11, No. 4, 480–496 (2014); English translation: J. Math. Sci., 207, No. 1, 26–38 (2015); https://doi.org/10.1007/s10958-015-2352-2.
2. I. M. Isaryuk and I. D. Pukal’s’kyi, “Nonlocal problem with oblique derivative and the optimization problem for parabolic equations,” Nauk. Visn. Chernivtsi Univ., Mat., Issue 528, 62–69 (2010).
3. I. M. Isaryuk and I. D. Pukal’s’kyi, “Nonlocal parabolic problem with degeneration,” Ukr. Mat. Zh., 66, No. 2, 208–215 (2014); English translation: Ukr. Math. J., 66, No. 2, 232–241 (2014); https://doi.org/10.1007/s11253-014-0925-8.
4. e, Linear and Quasilinear Equations of Parabolic Type, Naukа, Moscow (1967); English translation: Transl. Math. Monogr., Vol. 23, AMS, Providence, RI (1968.
5. E. M. Landis, Second-Order Elliptic and Parabolic Equations [in Russian], Nauka, Moscow (1971).