#E.5126 0125 059
Levitan, B. M.
The application of generalized displacement operators to linear differential equations of the second order. ([Uspehi Matematideskih nauk (N.S.) 4, no. 1(29), 3-122 (1949)] Providence, American Mathematical Sécety, 1951.
135 pe 23 cm, (American Mathematical Society. Translations, no. 59)
1. Differential equations.