Henriques, A. S., P. A. Skrelin, V. V. Evdokimova, T. V. Kachkovskaia, M. C. Borrego, L. P. Ferreira, P. P. B. Zuleta, S. Ruseishvili, and S. Madureira. “The Perception of Brazilian Portuguese Open and Close Mid Vowels by Native Russian Speakers”. Journal of Speech Sciences, vol. 8, no. 2, Aug. 2020, pp. 59-84, doi:10.20396/joss.v8i2.14995.