R. K. Giger and G. Engel, “Albert Hofmann’s Pioneering Work on Ergot Alkaloids and Its Impact on the Search of Novel Drugs at Sandoz, a Predecessor Company of Novartis: Dedicated to Dr. Albert Hofmann on the occasion of his 100th birthday”, Chimia, vol. 60, no. 1-2, p. 83, Feb. 2006, doi: 10.2533/000942906777675164.