00277nam a2200109 a 450000500170000002000150001708200130003210000160004524500330006126000450009430000280013920251203110737.0  a8173196281  a539bSAX  aSaxena A.K.  aPrinciples of modern physics  aNew DelhibNarosa Publishing Housec2005  axxii, 877p.c24 cm. PB.