@article{3065069,
    title = "Advanced results in enumeration of hyperstructures",
    author = "Bayon, R. and Lygeros, N.",
    journal = "Journal of Algebraic Combinatorics",
    year = "2008",
    volume = "320",
    number = "2",
    pages = "821-835",
    issn = "0925-9899",
    doi = "10.1016/j.jalgebra.2007.11.010",
    abstract = "We first recall our results on enumeration of hypergroups and Hv-groups of order 2, 3 and 4. Then we carry out a study on posets of hypergroups and Hv-groups. These results are extended to hyperrings. We finally explain the algorithms used. © 2007 Elsevier Inc. All rights reserved."
}