1. A DNA assay to quantitate concentrations of bull sperm;Bollig,1988
2. Basic fundamentals, calibration and rechecks of the photometer;Foote,1972
3. Principles and procedures for photometric measurement of sperm cell concentration;Foote,1978
4. A simple, rapid, and sensitive DNA assay procedure;Labarca;Anal. Biochem.,1980
5. Applied linear statistical models;Neter,1974