Maksim L. Fedotov. Chapter 7. Interaction of verbal categories in Gban and a method for describing language-specific hierarchies of interacting categories // Viktor S. Xrakovskij, Andrey L. Malchukov (eds.). Hierarchy and Interaction of Verbal Categories across Languages [LINCOM Studies in Language Typology 34]. München: LINCOM, 2021. Pp. 167–188.