1. P. Newman, Optical Resolution Procedures for Chemical Compounds, Vols 1–3, Optical Resolutions Information Center, Manhattan Colege, Riverdale, New York, 1978-84.
2. S. H. Wilen, A. Collet and J. Jacques, Tetrahedron, 33 (1977) 2725.
3. J. Jacques, A. Collet and S. H. Wilen, Enantiomers, Racemates and Resolutions, Wiley and Sons, New York 1981.
4. 3576854. US patent (1971).
5. E. Felder, D. Pitrč and S. Boveri, Helv. Chim. Acta, 52 (1969) 329.