matematica TecaLibri A. N. Tikhonov: opere 1979 The Methods for Solving Ill-Posed Problems, Nauka, Moskva, [rif.] con: V. Ya. Arsenin 1987 Ill-Posed Problems in the Natural Sciences, Mir, Moskva, [rif.] a cura di: idem, A. V. Goncharsky