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. Les Fonctions Quasi Analytiques;Carleman,1926
4. The generalized Carleman formula and its application to the analytic continuation of functions;Goluzin;Sb. Math.,1933
5. On the Cauchy problem for second-order linear elliptic equations;Lavrent’ev;Rep. USSR Acad. Sci.,1957