000
00241nam a2200085Ia 4500
008
240404s9999 xx 000 0 und d
245
0
_a
Proceedings of Symposia in Pure Mathematics: vol XX
260
_a
Providence
_b
AMS
_c
1971
942
_a
IMAR
_c
CART
999
_c
33826
_d
33826