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↑ Eric Smith; Norman Hosansky; W. G. Bywater; Eugene E. van Tamelen (1957). “Constitution of Samidin, Dihydrosamidin and Visnadin”. J. Am. Chem. Soc. 79 (13): 3534–3540. doi:10.1021/ja01570a062. Đã bỏ qua tham số không rõ |last-author-amp= (gợi ý |name-list-style=) (trợ giúp)
