@article{10_1090_S0894_0347_1989_0991015_7,
     author = {Anick, David J.},
     title = {Hopf algebras up to homotopy},
     journal = {Journal of the American Mathematical Society},
     pages = {417--453},
     publisher = {mathdoc},
     volume = {02},
     number = {3},
     year = {1989},
     doi = {10.1090/S0894-0347-1989-0991015-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1989-0991015-7/}
}