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K. Kimura, J. Takata. "A Pharmacognstical study on "Ma-wo" or "Ma Huang" and "Ma-wo-kon" or "Ma Huang Hên", Chinese drags. (Anatomies of Ephedra sinica, Stapf. and E. foliata, Boiss, Gnetaceae.)." Yakugaku zasshi (1930) 563-572