@article{TAC_1995_1_a6,
     author = {Robert Dawson},
     title = {A forbidden-suborder characterization of binarily-composable diagrams in double categories},
     journal = {Theory and applications of categories},
     pages = {146--153},
     publisher = {mathdoc},
     volume = {1},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_1995_1_a6/}
}