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Zhang, Jin, Dan Wu, Cheng Xie, Huan Wang, Wei Wang, Hui Zhang, Rui Liu, Li-Xian Xu, and Xiao-Peng Mei. Tramadol and Propentofylline Coadministration Exerted Synergistic Effects On Rat Spinal Nerve Ligation-Induced Neuropathic Pain. Public Library of Science, 2013.

Zhang, Jin, et al. Tramadol and Propentofylline Coadministration Exerted Synergistic Effects On Rat Spinal Nerve Ligation-Induced Neuropathic Pain. Public Library of Science, 2013.