HW Campbell
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Campbell, H. W. (1970)
Hierarchical ordering of phonetic features as a function of input
modality.
In G.B. Flores d'Arcais and W. J. M. Levelt (Eds.)
Advances in Psycholonguistics,
Amsterdam: North-Holland.
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Campbell, H. W. (1974)
Phoneme Recognition by Ear and by Eye: A Distinctive Feature
Analysis,
unpublished dissertation, University of Nijmegen, Holland.