On a Combinatorial Theorem of Erdös, Ginzburg and Ziv. - Yahya Ould Hamidoune; Oscar Ordaz; Asdrubal Ortuño (Comb. Probab. Comput., 1998)

Existence conditions for barycentric sequences. - Charles Delorme; Isabel Marquez; Oscar Ordaz; Asdrubal Ortuño (Discret. Math., 2004)