@article{PDML_1976__13_4_27_0, author = {Cenkl, Bohumil}, title = {Iterated {Integrals} and {Homotopy} {Periods}}, journal = {Publications du D\'epartement de math\'ematiques (Lyon)}, pages = {27--71}, publisher = {Universit\'e Claude Bernard - Lyon 1}, volume = {13}, number = {4}, year = {1976}, zbl = {0407.58002}, mrnumber = {478141}, language = {en}, url = {http://www.numdam.org/item/PDML_1976__13_4_27_0/} }