@article{DMTCS_2021_23_1_a6,
     author = {Duffy, Christopher and Shan, Sonja Linghui},
     title = {On the existence and non-existence of improper homomorphisms of oriented and $2$-edge-coloured graphs to reflexive targets},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2021-2022},
     doi = {10.46298/dmtcs.6773},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.6773/}
}