References
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- SAS Institute Inc. (1986b). SAS System for Linear Models, 1986 ed. SAS Institute Inc., Cary, NC.
- SAS Institute Inc. (1989). SAS/STAT User's Guide, Version 6, 4th ed. Vol. 1 and Vol. 2. SAS Institute Inc., Cary, NC.
- Steel, R. G. D. and Torrie, J. H. (1980). Principles and Procedures of Statistics, 2nd ed. McGraw-Hill, New York, NY.