@article{CMH_1971__46_139459,
     author = {J.R. Hubbuck},
     title = {Primitivity in torsion free cohomology {Hopf} algebras},
     journal = {Commentarii mathematici Helvetici},
     pages = {13},
     publisher = {mathdoc},
     volume = {46},
     year = {1971},
     zbl = {0225.57023},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/CMH_1971__46_139459/}
}