00338nam a2200109 a 450000500170000002000150001708200200003210000230005224500900007526000420016530000210020720251203091952.0  a0070995729  a515.35,bD, Sim  aSimmons, George F.  aDifferential equations: With applications and Historical Notes, George F.Simmons, eng  aNew Delhi, Tata McGraw-Hill, Inc1997  axv,465p.c22 cm.