V. F. Moreira, “RF Phonetic realization of the vowel phonemes /a/ and /e/ and the phonological sequences /an/ and /en/ in initial, medial and final positions not accentuated by Angolan speakers of Portuguese: Okulemulula ocisosomuila lie yevaliso /a/ kuenda /e/ o londaka vi likuama /na/ kuenda /en/ vojongo ye fetikilo kuenda esulilo ka likuete epongoloko kuava va popia elimi lio puto vo Ngola”, Revista Njinga & Sepé, vol. 4, no. 2, pp. 244–259, Sept. 2024, Accessed: Nov. 15, 2026. Available: https://revistas.unilab.edu.br/njingaesape/article/view/1690