1. Ladyzhenskaya, O.A., Solonnikov, V.A., and Ural’tseva, N.N., Lineinye i kvazilineinye uravneniya parabolicheskogo tipa (Linear and Quasi-Linear Equations of Parabolic Type), Moscow: Nauka, 1967.
2. Romanov, V.G., Obratnye zadachi matematicheskoi fiziki (Inverse Problems of Mathematical Physics), Moscow: Nauka, 1984.
3. Prilepko, A.I. and Kostin, A.B., Inverse Problems of Determining a Coefficient in a Parabolic Equation. I, Sibirsk. Mat. Zh., 1992, vol. 33, no. 3, pp. 146–155.
4. Prilepko, A.I. and Kostin, A.B., Inverse Problems of Determining a Coefficient in a Parabolic Equation. II, Sibirsk. Mat. Zh., 1993, vol. 34, no. 5, pp. 147–162.
5. Iskenderov, A.D., Multidimensional Problems for Linear and Quasilinear Parabolic Equations, Dokl. Akad. Nauk SSSR, 1975, vol. 225, no. 5, pp. 1005–1008.