1. M. M. Lavrent’ev and V. G. Romanov, “On three linearized inverse problems
for hyperbolic equations,” Dokl. Akad. Nauk SSSR 171 (6), 1279–1281 (1966).
2. M. M. Lavrent’ev, V. G. Romanov, and V. G. Vasil’ev, Multidimensional Inverse Problems for Differential Equations
(Nauka, Novosibirsk, 1969) [in Russian].
3. V. G. Romanov, Some Inverse Problems for
Hyperbolic Type Equations (Nauka, Novosibirsk, 1972)
[in Russian].
4. V. G. Romanov, Inverse Problems for
Differential Equations (Izd. Novosib. Gos. Univ., Novosibirsk, 1973)
[in Russian].
5. M. M. Lavrent’ev, V. G. Romanov, and S. P. Shishatskii, Ill-Posed Problems of Mathematical Physics (Nauka, Moscow, 1980)
[in Russian].