@article{10_4153_CJM_1977_077_3,
     author = {Fawcett, Barry},
     title = {A {Canonical} {Factorization} for {Graph} {Homomorphisms}},
     journal = {Canadian journal of mathematics},
     pages = {738--743},
     year = {1977},
     volume = {29},
     number = {4},
     doi = {10.4153/CJM-1977-077-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-077-3/}
}