1. The development of Middle Chinese entering tone in the Guan-zhong area;Bai,1932
2. The time dimension: contribution toward a theory of sound change;Chen;Found, Language,1972
3. Phonological change of Middle Chinese initials;Cheng;Tsing Hua J. Chin. Stud., New Series IX,1971
4. The Ju-sheng tone in Pekinese;Forrest;Bull. School Orient. Stud.,1950
5. The development of Middle Chinese entering tone in Pekinese;Hsieh,1971