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2. Physostigmin ein Gegengift des Curare;Pal;Zentralblatt für Physiologie,1900
3. On the properties of the Ordeal-Bean of Old Calabar. Western Africa;Christison;Monthly Journal of Medicine,1855
4. Description of the plant which produces the Ordeal Bean of Calabar;Balfour;Transactions of the Royal Society of Edinburgh,1861