Mei, D.W., Zheng, G.N., & Li, X.Y. 1991 [The occurrence and control of Aulacaspis difficilis (Ckll) in Pingliang Prefecture of [China's] Gansu Province.]. Plant Protection No. 5, 18-19.
Mei, D.W., Zheng, G.N., & Li, X.Y. 1991 [The occurrence and control of Aulacaspis difficilis (Ckll) in Pingliang Prefecture of [China's] Gansu Province.]. Plant Protection No. 5, 18-19.