1. Barrett, H. C., and A. M. Rhodes. 1976. A numerical taxonomic study of affinity relationships in cultivatedCitrus and its close relatives. Syst. Bot. 1:105–136.
2. Ding, S., X. Zhang, Z. Bao, and M. Liang. 1983. The ichang papeda in Yunnan. Research Report, Yunnan Academy of Agricultural Sciences, Kunming, Yunnan, People’s Republic of China. (Chinese.)
3. —, —, —, and — 1984. A new species ofPoncirus from China. Acta Bot. Yunnan. 6:292–293. (Chinese.)
4. Guo, T. 1981. A survey report about the citrus germplasm in Xishuang Banna of Yunnan. Research Reports on Special Topics No. 81-03, Citrus Research Institute, Chinese Academy of Agricultural Sciences, Chongqing, Sichuan, People’s Republic of China. (Chinese.)
5. Li, D., C. Wan, and S. Liang. 1983. An investigation on fingered citron in Weishang County. Yunnan’s Sei. & Technol. 2:60–61. (Chinese.)