Karhumäki, J., Saarela, A. and Zamboni, L.Q. 2017. Variations of the Morse-Hedlund theorem for k-abelian equivalence. Acta Cybernetica. 23, 1 (Jan. 2017), 175-189. DOI:https://doi.org/10.14232/actacyb.23.1.2017.11.