1. This Journal;Fantus,1916
2. Thesis, University of Maryland;Kregiel,1951
3. Partington, J. R., “An Advanced Treatise of Physical Chemistry. vol. 3, Longmans, Green and Co., Inc., New York, p. 46.
4. This Journal;Fantus,1916
5. Thesis, University of Maryland;Kregiel,1951