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Duffield, A. M.; Aplin, R. T.; Budzikiewicz, H.; Djerassi, Carl; Murphy, C. F.; Wildman, W. C. . (1965). Mass Spectrometry in Structural and Stereochemical Problems. LXXXII. <sup>1</sup> A Study of the Fragmentation of Some Amaryllidaceae Alkaloids <sup>2</sup>. Journal of the American Chemical Society, 87(21), 4902–4912. doi:10.1021/ja00949a038 
10.1021/ja00949a038