000 00339nam a2200133Ia 4500
008 211215s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
100 _aHeading J
245 0 _aIntroduction to phase integral methods
250 _a1st
260 _bMethuen
_aLondon
_c1962
300 _a160p p.
942 _c1
999 _c81000
_d81000