00309nam a2200109 a 450000500170000002000150001708200200003210000210005224500660007326000380013930000220017720251203091926.0  a9810204604  a515.35,bD, Ras  aRassias, John M.  aCounter examples in differential equations and related topics  aSingaporebWorld Scientificc1991  avii,184p.c21 cm.