His Semi-classical approximation in quantum mechanics, c1981 EDSRC:Idempotent analysis and its applications / by Vassili N. Kolokoltsov and Victor P. Maslov(Kluwer Academic Publishers, c1997)
See from' reference
Маслов, В. П. (Виктор Павлович)<マスロフ> Maslov, V Maslov, Victor P マスロフ