鲁北三县语调的“单调性”及其对“舒声促化”和“准舒声促化”的影响
宋洪民
  On the Monotony of Intonation of Three Counties'Dialects in the North of Shandong Province and Its Influence upon the Transformation From Smooth Syllables into Checked Syllables
Song Hongmin
语言科学 . 2006, (2): 66 -75 .