1. Statistics and Computer Science Graduate ProgramColegio de Postgraduados, Montecillo, TexcocoMéxicoCP56230
2. NIDERASA 2600 VenadoTuertoArgentina
3. Dep. of Animal Sciences, Dairy Science, and Biostatistics and Medical InformaticsUniv. of WisconsinMadisonWI
4. Biometrics and Statistics Unit, International Maize and Wheat Improvement Center (CIMMYT)Apdo.México City