00288nam a2200121Ia 4500008004100000041001200041082001100053100001600064245005700080260000600137650000600143700001700149221030s9999    xx            000 0 und d  aEnglish  a105.23  aR. K. Gupta 0aDifferential Equationscby R. K. Gupta, J. N. Sharma  c0  aB  aJ. N. Sharma