Dolgopolski, A.B.
[russ.] Materialy po sravnitel'no-istoričeskoj fonetike kusitskix jazykov: gubnye i dental'nye smyčnye v načal'nom polozenii ['Materials for the comparative and historical phonetics of the Cushitic languages: labial and dental occlusives in initial position']
1966
Moskau
35-88