000 00264nam a22000977a 4500
008 120725b xxu||||| |||| 00| 0 eng d
050 _aQC20.7
_b.C43 1990
100 _achattopadhyay
245 _amathematical physics
260 _aNEW DELHI
_bWILEY EASTERN LIMITED
_c1990
999 _c65202
_d65202