Structure and asymptotic expansion of multiple harmonic sums. - Christian Costermans; Jean-Yves Enjalbert; Vincel Hoang Ngoc Minh; Michel Petitot (ISSAC, 2005)

Calcul symbolique non commutatif : analyse des constantes d'arbre de fouille. (Noncommutative symbolic computation : analysis of search trees constants). - Christian Costermans (2008)

Noncommutative algebra, multiple harmonic sums and applications in discrete probability. - Christian Costermans; Vincel Hoang Ngoc Minh (J. Symb. Comput., 2009)