@article{MOMA_1975__80_177727,
     author = {W. Imrich and Herbert Izbicki},
     title = {Associative {Products} of {Graphs.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {277--282},
     publisher = {mathdoc},
     volume = {80},
     year = {1975},
     zbl = {0328.05136},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1975__80_177727/}
}