1. Portuguese nasal vowels: Phonetics and phonemics;Almeida;Schmidt-Radefeld (1976),1976
2. Les voyelles nasales portugaises: Interprétation phonologique;Barbosa,1962
3. Etudes de phonologie portugaise;Barbosa,1965
4. Portuguese r ≈ r̃: Luisitanean and Brazilian allophones;Brakel;Studies in Linguistics,1974
5. A gramática gerativa e a pluralização em português;Brakel;Boletim de Filologia,1979