00286nam a2200109Ia 4500008004100000041000800041082002000049100001700069245007300086260000900159300000800168211209s1978    xx            000 0 und d  aeng  a515.353 N78 STE  aSTEPHENSON G  aINTRODUCTION TO PARTIAL DIFFERENTIAL EQUATIONS FOR SCIENCE STUDENTS   c1978  a151