TY - JOUR TI - Advanced results in enumeration of hyperstructures AU - Bayon, R. AU - Lygeros, N. JO - Journal of Algebraic Combinatorics PY - 2008 VL - 320 TODO - 2 SP - 821-835 PB - SN - 0925-9899 TODO - 10.1016/j.jalgebra.2007.11.010 TODO - null TODO - 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. ER -