Ligia Loreta Cristea, Helmut Prodinger. q-Enumeration of words by their total variation.
Discrete Mathematics and Theoretical Computer Science, DMTCS, 2011, special issue in honor of Laci Babai's 60th birthday: Combinatorics, Groups, Algorithms, and Complexity, Vol. 12 no. 3 (3), pp.139-150.
⟨10.46298/dmtcs.477⟩.
⟨hal-00993529⟩