TY  - JOUR
AU  - Dădărlat, Marius
AU  - Eilers, Søren
TI  - The Bockstein Map is Necessary
JO  - Canadian mathematical bulletin
PY  - 1999
SP  - 274
EP  - 284
VL  - 42
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1999-033-0/
DO  - 10.4153/CMB-1999-033-0
ID  - 10_4153_CMB_1999_033_0
ER  -