00872nam0-22002891i-450-990001034680403321000103468FED01000103468(Aleph)000103468FED0100010346820000920d1969----km-y0itay50------baengApproximation methods in quantum mechanicsA.B. Migdal and V. Krainovtranslated by Anthony J. LeggettNew YorkBenjamin1969Frontiers in physics33Meccanica quantistica530.12Migdal,Arkadii Beinusovich48392Krainov,Vladimir PavlovichITUNINARICAUNIMARCBK99000103468040332122-0896558FI1FI1Approximation methods in quantum mechanics338869UNINAING01