00422nam a2200169   450000500170000000700040001700800040002104000090002505000230003410000170005724500400007425000170011426000500013130000160018150000190019765000360021620141118083121.0000000  aUOEL  aQC20.82b.G86 1993  aGupta, B. D.  aMathematical physics /cB. D. Gupta  a2nd rev. ed.  aNew Delhi ;bVikas publishing house ,cc1993.  avol..bill.  aIncludes index  aMathematical - physicsxPhysics