Stephan, Barbara, Herbert Zinner, Fritz Kastner, and Albrecht Mannschreck. 1990. “Enantiomers of 2,2’-Spirobichromenes: Energy Barrier for Thermal Racemization During HPLC on Tribenzoylcellulose”. CHIMIA 44 (10): 336. https://doi.org/10.2533/chimia.1990.336.