00504nam a2200157 a 4500008004100000020001500041040002500056082001700081100002000098245006900118250001200187260006700199250001200266300003200278650003600310100613r19971995ii a     b    001 0 eng d  a8120309790  aDB-DhAALcDB-DhAAL  00a515/.3532201 aRao, K. Sankara00aIntroduction to partial differential equations /cK. Sankara Rao  a6th ed.  aNew Delhi :bPrentice-Hall of India, cc1995.[reprinted 1997]	  a2nd ed.  aX, 357 p. :bill. ;c24 cm  0aDifferential equations, partial