@article{ERAAMS_2006_12_a1,
     author = {Zaslavsky, Thomas},
     title = {Quasigroup associativity and biased expansion graphs},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {13--18},
     publisher = {mathdoc},
     volume = {12},
     year = {2006},
     doi = {10.1090/S1079-6762-06-00155-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-06-00155-7/}
}