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Bolton, S., Interaction of Urea and Thiourea with Benzoic and Salicylic Acids, J. Pharm. Sci., 1963, 52, 1071-1074. [all data]
Bolton, S.; Guttman, D.; Higuchi, T., Complexes Formed in Solution by Homologs of Caffeine., J. Am. Pharm. Assoc., Sci. Ed., 1957, 46, 38-41. [all data]