TY - J Integr Plant Biol A1 - Chen Qing-cheng, Zhao Song-ling and Yang Feng-xiang T1 - Mathematical Models of Retrogression of Populations under Grazing Condition in the Stipa Steppe Y1 - JF - Journal of Integrative Plant Biology JO - J Integr Plant Biol SP - EP - VL - 23 IS - 4 UR - https://www.jipb.net N1 - ER -