00281nam a2200121Ia 4500008004100000041001200041082001100053100001500064245005200079260000600131650000600137700001600143221030s9999    xx            000 0 und d  aEnglish  a105.23  aR. K. Gaur 0aEngineering Physicscby R. K. Gaur, S. L. Gupta  c0  aB  aS. L. Gupta