CVETKO-OREŠNIK, Varja. The o-grade of the Indo-European ablaut in the light of naturalness. Linguistica, Ljubljana, SI, v. 41, n. 1, p. 159–162, 2001. DOI: 10.4312/linguistica.41.1.159-162. Disponível em: https://journals.uni-lj.si/linguistica/article/view/3805. Acesso em: 15 may. 2025.