00244nam a2200109 a 450000500170000008200210001710000180003811000180005624500210007426000240009530000150011920251203091037.0  a620.112,bD, nar  aNarang G.B.S.  aNarang J.B.K.  aMaterial science  aDelhibKhannac1988  a762p, 22cm