Debruyn, A., Detaeye, L., Simonds, R., & Verzele, M. (1982). Alkaloids From Catharanthus Roseus - Isolation and Identification of 17-desacetoxyvinblastine and 17-desacetoxyleurosine. Societes Chimiques Belges. Bulletin, 91(1), 75-85. https://doi.org/10.1002/bscb.19820910111 (Original work published 1982)