00342nam a2200121Ia 4500008004100000040001700041041001200058082001600070100002300086245006200109260003800171300001100209230917s9999||||xx |||||||||||||| ||und||  e151084aMAIN  aEnglish  a515.35 S47D  aSimmons , George F 0aDifferential equations: Theory , technique , and practice  aNew DelhibTata McGraw-Hillc2009  a534 p.