Half-simple symmetric Venn diagrams. Killian, Charles E., Ruskey, Frank, Savage, Carla D., Weston, Mark (2004) The Electronic Journal of Combinatorics [electronic only]
Handshakes across a (round) table. Došlić, Tomislav (2010) Journal of Integer Sequences [electronic only]
Hankel determinants and the Sylvester theorem. (Déterminants de Hankel et théorème de Sylvester.) Radoux, Christian (1992) Séminaire Lotharingien de Combinatoire [electronic only]
Higher chain formula proved by combinatorics. Ma, Tsoy-Wo (2009) The Electronic Journal of Combinatorics [electronic only]
Hybrid proofs of the q -binomial theorem and other identities. Eichhorn, Dennis, McLaughlin, James, Sills, Andrew V. (2011) The Electronic Journal of Combinatorics [electronic only]
HYP and HYPQ. Mathematica packages for the manipulation of binomial sums and hypergeometric series respectively q -binomial sums and basic hypergeometric series. Krattenthaler, C. (1993) Séminaire Lotharingien de Combinatoire [electronic only]