1. Statistical Methods in Ophthalmology: An Adjustment for the Intraclass Correlation between Eyes
2. Steel R. G.D., Torrie J. H. Principles and Procedures of Statistics2nd ed. McGraw‐Hill, New York 1980; 137–153
3. Steel R. G.D., Torrie J. H. Principles and Procedures of Statistics2nd ed. McGraw‐Hill, New York 1980; 233–238
4. Snedecor G. W., Cochran W. G. Statistical Methods7th ed. Iowa State University Press, Ames, Iowa 1980; 291–292