1. Spectroscopic study of 3-methyl-2,4-diphenyl-3-azabicyclo[3.3.1]nonan-9-α(β)-ols
2. B. A. Frenz and associates, Structure Determination Package, College Station, Texas 77840 and Enraf-Nonius, Delft, Holland, 1985.
3. International Tables for X-Ray Crystallography, Vol IV, Kynoch Press, Birmingham, England, 1974, pp 72-78.