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@article{MS2_1972__31_166281, author = {Ivan Tafteberg Jakobsen}, title = {On {Certain} {Homomorphism} {Properties} of {Graphs} {I.}}, journal = {Mathematica Scandinavica}, pages = {379--404}, publisher = {mathdoc}, volume = {31}, year = {1972}, zbl = {0258.05126}, url = {http://geodesic.mathdoc.fr/item/MS2_1972__31_166281/} }
Ivan Tafteberg Jakobsen. On Certain Homomorphism Properties of Graphs I.. Mathematica Scandinavica, Tome 31 (1972), pp. 379-404. http://geodesic.mathdoc.fr/item/MS2_1972__31_166281/