客家话覃谈有别的存古层次
严修鸿 余颂辉
Chongyun “Tan(覃)” and “Tan(谈)” Contrasts in Modern Hakka
Yan Xiuhong Yu Songhui
语言科学 . 2013, (3): 277 -290 .  DOI: 10.7509/j.linsci.201301.027281