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Stephan, B. and Zinner, H. and Kastner, F. and Mannschreck, Albrecht (1990) Chiral 2H-Pyrans 2: Enantiomers of 2,2'-Spirochromenes: Energy Barrier for Thermal Racemization during HPLC on Tribensoylcellulose. Chimia 44, p. 336.
Mannschreck, Albrecht and Zinner, H. and Pustet, Nikola (1989) The Significance of the HPLC Time Scale: An Example of Interconvertible Enantiomers. Chimia 43, p. 165.