00339nam a2200133 a 450000500170000002000150001708200160003210000160004824500250006425000170008926000440010630000300015063000250018020251203091133.0  a0706996836  a530.15bGUP  aGupta, B D.  aMathematical Physics  a2nd Rev. ed.  aNew DelhibVikas Publishing Housec1996  axii, 1238 p.b25 cm.cPB.  aMathematical Physics