von Hörsten S, Exton MS, Schult M, et al. (May 1998). "Behaviorally conditioned effects of Cyclosporine A on the immune system of rats: specific alterations of blood leukocyte numbers and decrease of granulocyte function". J. Neuroimmunol. 85 (2): 193–201. doi:10.1016/S0165-5728(98)00011-3. PMID9630168. S2CID36315130.
Fowler A, Koutsioni Y, Sommer V (January 2007). "Leaf-swallowing in Nigerian chimpanzees: evidence for assumed self-medication". Primates. 48 (1): 73–6. doi:10.1007/s10329-006-0001-6. PMID16897194. S2CID24862484.
Koshimizu K, Ohigashi H, Huffman MA (December 1994). "Use of Vernonia amygdalina by wild chimpanzee: possible roles of its bitter and related constituents". Physiol. Behav. 56 (6): 1209–16. doi:10.1016/0031-9384(94)90368-9. PMID7878093. S2CID28512188.
von Hörsten S, Exton MS, Schult M, et al. (May 1998). "Behaviorally conditioned effects of Cyclosporine A on the immune system of rats: specific alterations of blood leukocyte numbers and decrease of granulocyte function". J. Neuroimmunol. 85 (2): 193–201. doi:10.1016/S0165-5728(98)00011-3. PMID9630168. S2CID36315130.
Fowler A, Koutsioni Y, Sommer V (January 2007). "Leaf-swallowing in Nigerian chimpanzees: evidence for assumed self-medication". Primates. 48 (1): 73–6. doi:10.1007/s10329-006-0001-6. PMID16897194. S2CID24862484.
Koshimizu K, Ohigashi H, Huffman MA (December 1994). "Use of Vernonia amygdalina by wild chimpanzee: possible roles of its bitter and related constituents". Physiol. Behav. 56 (6): 1209–16. doi:10.1016/0031-9384(94)90368-9. PMID7878093. S2CID28512188.
von Hörsten S, Exton MS, Schult M, et al. (May 1998). "Behaviorally conditioned effects of Cyclosporine A on the immune system of rats: specific alterations of blood leukocyte numbers and decrease of granulocyte function". J. Neuroimmunol. 85 (2): 193–201. doi:10.1016/S0165-5728(98)00011-3. PMID9630168. S2CID36315130.
Fowler A, Koutsioni Y, Sommer V (January 2007). "Leaf-swallowing in Nigerian chimpanzees: evidence for assumed self-medication". Primates. 48 (1): 73–6. doi:10.1007/s10329-006-0001-6. PMID16897194. S2CID24862484.
Koshimizu K, Ohigashi H, Huffman MA (December 1994). "Use of Vernonia amygdalina by wild chimpanzee: possible roles of its bitter and related constituents". Physiol. Behav. 56 (6): 1209–16. doi:10.1016/0031-9384(94)90368-9. PMID7878093. S2CID28512188.