1. The Cauchy Problem for Linear Partial Differential Equations of Hyperbolic Type;Hadamard,1978
2. On the solution of ill-posed problems and the method of regularization;Tikhonov;Dokl. Akad. Nauk. SSSR,1963
3. On the Cauchy problem for second-order linear elliptic equations;Lavrent’ev;Rep. USSR Acad. Sci.,1957
4. On Some Ill-Posed Problems of Mathematical Physics;Lavrent’ev,1962
5. On a Cauchy problem for Laplace's equation