@article{TAC_2011_25_a17,
     author = {Michael Barr and John F. Kennison and R. Raphael},
     title = {Flows: cocyclic and almost cocyclic},
     journal = {Theory and applications of categories},
     pages = {490--507},
     year = {2011},
     volume = {25},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2011_25_a17/}
}