1. Standards for investigation of human semen;Eliasson,1971
2. Clinical Chemistry Theory and Practice;Richterich,1969
3. Objective Determination of Sperm Activity [in Russian] Sibirski Scientific Institute of Domestic Animals;Morosov,1938
4. A one minute live-dead sperm stain by means of eosin-nigrosin;Blom;Fertil Steril,1950
5. Partial Staining of Spermatozoa in the Nigrosin-Eosin Stain;Dott,1956