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BERTRAM DS, BIRD RG.BERTRAM DS, et al.Trans R Soc Trop Med Hyg. 1961 Sep;55:404-23. doi: 10.1016/0035-9203(61)90085-2.Trans R Soc Trop Med Hyg. 1961.PMID: 13868491No abstract available.
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Bertram DS.Bertram DS.Trans R Soc Trop Med Hyg. 1969;63(1):125. doi: 10.1016/0035-9203(69)90093-5.Trans R Soc Trop Med Hyg. 1969.PMID: 5815238No abstract available.