1. Conn H. J. Biological Stains. 6th ed. Biotech Publications, Geneva, New York 1953; 286
2. The Histochemical Significance of Staining Polysaccharide Sulfate Esters with Gentian Violet
3. Lillie R. D. Histopathologic Technic and Practical Histochemistry. The Blakiston Company, New York, N. Y. 1954; 284, 292