00242nam a2200109Ia 4500100002600000250000600026654001600032245002400048260003100072082001700103546001200120  aGaur/R.K & gupta S.L   a8  aengineering  aEngineering physics  bDHANPAT RAI AND SONSc2001  a530bGAU/GUP  aENGLISH