000
00297nam a2200121Ia 4500
008
210901s1972 xx 000 0 eng d
082
_a
517.2 OPE
100
_a
Open university
245
0
_a
Differential equations II
260
_b
Open university press
_c
1972
300
_a
50p.
942
_2
ddc
_c
BK
999
_c
10411
_d
10411