1. A. von Zelewsky, Stereochemistry of Coordination Compounds, Wiley, 1996, pp. 78-101.
2. Zur Kenntnis des asymmetrischen Kobaltatoms. I
3. Spontaneous resolution means that the two enantiomers in a racemate crystallize in separate crystals, thus forming a conglomerate. Total spontaneous resolution is possible if the enantiomers racemize in solution during crystallization. See also reference [4].