00266nam a2200121Ia 4500008004100000020001800041082001000059100001500069245002600084250000600110260002000116300000800136240801s9999 xx 000 0 und d a9788194322535 bSAN-E aSARKAR B N 0aENGINEERING PHYSICS-1 a1 aNEW DELHIc2020 a187