1. Bawar, Z., Brewster, R.C., Marcotte, D.A.: Homomorphism duality in edge-coloured graphs. Annales des sciences mathématiques du Québec 29(1), 21–34 (2005)
2. Bok, J., Brewster, R. C., Feder, T., Hell, P., and Jedlicková, N.: List homomorphism problems for signed graphs. Proceedings of the 45th International Symposium on Mathematical Foundations of Computer Science (MFCS 2020), Leibniz International Proceedings in Informatics (LIPIcs) 170, 20:1–20:14, (2020)
3. Brewster, R. C.: Vertex colourings of edge-coloured graphs, PhD thesis, Simon Fraser University, Canada,(1993)
4. Brewster, R.C.: The complexity of colouring symmetric relational systems. Discrete Appl. Math. 49(1–3), 95–105 (1994)
5. Brewster, R.C., Dedić, R., Huard, F., Queen, J.: The recognition of bound quivers using edge-coloured homomorphisms. Discrete Math. 297, 13–25 (2005)