1. N. Ya. Beznoshchenko, ?On finding a coefficient in a parabolic equation,?Differents. Uravn.,10, No. 1, 24?35 (1974).
2. B. F. Jones, ?The determination of a coefficient in a parabolic differential equation. Part I,?J. Math. Mech.,11, No. 6, 907?918 (1962).
3. N. I. Ionkin and E. I. Moiseev, ?A problem for the heat-conduction equation with two-point boundary conditions,?Differents. Uravn.,15, No. 7, 1284?1295 (1979).
4. L. Collatz,Functional Analysis and Numerical Mathematics, Academic Press, New York (1966).