000
00262nam a2200109Ia 4500
008
210901s1976 xx 000 0 eng d
082
_a
530.15 GUP
100
_a
Gupta P P
245
0
_a
Mathematical physics
260
_a
Merrut
_b
Kedarnath
_c
1976
942
_2
ddc
_c
BK
999
_c
11816
_d
11816