00310nam a2200121Ia 4500082002000000100002000020245003400040260003400074300002700108490004300135500000500178700000500183  a515.35bW319.LT  aWasow, Wolfgang  aLinear turning point theoryb  aBerlinbSpringer-Verlagc1985  aix, 246p. Index, Bibl.  aApplied Mathematical Sciences v v. 54  a  a