TY - JOUR AU - J.R. Hubbuck TI - Primitivity in torsion free cohomology Hopf algebras JO - Commentarii mathematici Helvetici PY - 1971 SP - 13 VL - 46 PB - mathdoc UR - https://geodesic-test.mathdoc.fr/item/CMH_1971__46_139459/ LA - un ID - CMH_1971__46_139459 ER -