00932nam0-22003371i-450-99000001233040332120100212105706.0000001233FED01000001233(Aleph)000001233FED0100000123320020821d1962----km-y0itay50------baengy-------001yy<<An >>introduction to phase-integral methodsJ. HeadingNew YorkJ. Wiley and sonsLondonMethuen1962160 p.ill.19 cmFisica530Heading,John42243ITUNINARICAUNIMARCBK99000001233040332113 B 31 0724839FINBC10 B II 345621DINELMXV-A-113024692MASFINBCDINELMASIntroduction to phase-integral methods108279UNINA