42 citations to https://www.mathnet.ru/rus/im1314

E. M. Dyn’kin, “The Pseudoanalytic Extension”, J. Anal. Math, 60:1 (1993), 45
Alf Jonsson, Teubner-Texte zur Mathematik, 133, Function Spaces, Differential Operators and Nonlinear Analysis, 1993, 285