BIBCYT http://bibcyt.ucla.edu.ve/cgi-win/be_alex.exe?Ultimo&Nombrebd=BIBCYT UCLA - Biblioteca de Ciencias y Tecnologia Felix Morales Bueno Hayter, A.J P Principal Liu, W. P Principal Wynn, H.P. P Principal Easy-to-construct confidence bands for comparing two simple linear regression lines p1213-1225, 13p