1. in The Alkaloids, Vol. 3 (Eds: ), Academic Press, New York, 1953, p. 120;
2. in Rodd's Chemistry of Carbon Compounds, Vol. IV, part H (Ed: ), Elsevier, Amsterdam, 1978, chap. 38, p. 285;
3. , in The Alkaloids, Vol. 31 (Ed: ), Academic Press, New York, 1997, p. 117.
4. 420. Cytisine. Part II
5. Über Cytisin und Ulexin