1. J.-L. Lions, Optimal Control of Systems Governed by Partial Differential Equations, Springer-Verlag, New York (1971).
2. O. M. Alifanov, Identification of Heat Transfer Processes in Aircraft (Introduction to the Theory of Inverse Heat Transfer Problems) [in Russian], Mashinostroenie, Moscow (1979).
3. O. M. Alifanov, Inverse Heat Transfer Problems [in Russian], Mashinostroenie, Moscow (1988).
4. O. M. Alifanov, E. A. Artyukhin, and S. V. Rumyantsev, Extremal Methods to Solve Ill-Posed Problems [in Russian], Nauka, Moscow (1988).
5. J. Su and A. J. Silva Neto, “Heat sourse estimation with the conjugate gradient method in inverse linear diffusive problems,” J. Braz. Soc. Mech. Sci., 23, No. 3, 321–334 (2001).