@article{DMGT_1995_15_1_a7,
     author = {Fisk, Steve},
     title = {Distinguishing graphs by the number of homomorphisms},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {73--75},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_1995_15_1_a7/}
}