Synthesis of the AB-ring of 9,11-secosterolsAav, Riina; Kanger, Tõnis; Pehk, Tõnis; Lopp, MargusSynlett2000 / No. 4, p. 529-531 https://www.researchgate.net/publication/228068773_Synthesis_of_the_AB-Ring_of_911-Secosterols