1. Zero and Panum;Allen;Indian Linguistics,1955
2. System and structure in the Abaza verbal complex;Allen;TPS,1956
3. On one-vowel systems;Allen;Lingua,1965
4. The predictability of vowel patterns in the Hebrew verb;Aronson;Glossa,1969
5. Sur l'aspect subjectif de la distinction entre voyelle et consonne;Belardi;AION, Sez Ling,1962