@article{SLC_1994_33_a1,
     author = {R. Bodendiek and R. Lang},
     title = {On {Alternating} {Products} of {Graph} {Relations}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {33},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/SLC_1994_33_a1/}
}