@article{10_37236_618,
     author = {H. Aghabozorgi and M. Jafarpour and B. Davvaz},
     title = {Enumeration of {Varlet} and {Comer} hypergroups.},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {1},
     doi = {10.37236/618},
     zbl = {1221.20049},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/618/}
}