There are more than 2 n / 17 n -letter ternary square-free words. Ekhad, Shalosh B.; Zeilberger, Doron — 1998 Journal of Integer Sequences [electronic only]
The number of solutions of X 2 = 0 in triangular matrices over G F ( q ) . Ekhad, Shalosh B.; Zeilberger, Doron — 1996 The Electronic Journal of Combinatorics [electronic only]
A short WZ-style proof of Abel's identity. Ekhad, Shalosh B.; Majewicz, John E. — 1996 The Electronic Journal of Combinatorics [electronic only]
Proof of Conway's lost cosmological theorem. Ekhad, Shalosh B.; Zeilberger, Doron — 1997 Electronic Research Announcements of the American Mathematical Society [electronic only]
A binomial coefficient identity associated to a conjecture of Beukers. Ahlgren, Scott; Ekhad, Shalosh B.; Ono, Ken; Zeilberger, Doron — 1998 The Electronic Journal of Combinatorics [electronic only]