00270nam a2200109 a 450000500170000008200200001710000270003724500260006425000130009026000360010330000210013920251203091800.0  a530.13,bD, gup  aGupta, S.L., Kumar, V.  aStatistical mechanics  a12th ed.  aMeerutbPragati Prakashanc1993  aviii, 455p, 22cm