1. Colegio de Postgraduados, Statistics and Computer Sciences; Montecillos Edo. de Mexico Mexico
2. Biometrics and Statistics Unit; International Maize and Wheat Improvement Center (CIMMYT); Apdo. Postal 6-641 Mexico DF 06600 Mexico
3. Biometrics and Breeding Research; Bayer CropScience; Morrisville NC
4. Biometrics and Breeding Research; Bayer CropScience; Ghent Belgium
5. Biostatistics Dep.; Univ. of Alabama at Birmingham; Ryals Public Health Bldg. 443 Birmingham 35294