@article{DIA_2012__S67-68__177_0,
     author = {Kainen, Paul C.},
     title = {Graph cycles and diagram commutativity},
     journal = {Diagrammes},
     pages = {177--237},
     publisher = {Universit\'e Paris 7, Unit\'e d'enseignement et de recherche de math\'ematiques},
     volume = {S67-68},
     year = {2012},
     mrnumber = {3024906},
     zbl = {1338.05135},
     language = {en},
     url = {http://www.numdam.org/item/DIA_2012__S67-68__177_0/}
}