Valentin Vydrin. Tonal density index in Mande and beyond. “West-central African linguistic history between Macro-Sudan Belt and Niger-Congo: commemorating the 100th anniversary of the Berlin professorship for African languages and the legacy of Diedrich Westermann”. Berlin, Humboldt-Universität zu Berlin, November 4-6, 2021.

Valentin Vydrin & Elena Perekhvalskaya. Tonal density index: quantitative characteristics of tonal languages. 1st International Conference on Tone and Intonation. Sønderborg, Denmark, 6-9 December 2021.

Elena Perekhvalskaya, Valentin Vydrin. Tonal density and classification of tonal languages: Some African cases. 4th Symposium on West African Languages SyWAL2022, 21-23 September 2022, University of Napoli L’Orientale.

Elena Perekhvalskaya, Valentin Vydrin. Tonal density and its correlation with the types of tonal systems: Diachronic aspects. 26th International Conference on Historical Linguistics – ICHL26. Heidelberg, 4-9 décembre 2023.