00313nam a2200121Ia 4500082002000000100002000020245004500040260003600085300002100121490003900142500000500181700000500186  a515.35bL831.AP  aLogan, J. David  aApplied partial differential equationsb  aNew YorkbSpringer-Verlagc1998  axii, 181p. Index  aUndergraduate texts in Mathematics  a  a