000
00257nam a2200109 4500
008
160616s 000 0
245
_a
Rings of differential operators
100
_a
Bjork, J.E
500
_a
B334,1 L9
942
_c
BK
_2
BK3832
080
_a
517.95 BJO
999
_c
3832
_d
3832