Sur certaines \'el\'ements r\'eguliers des groupes de Weyl et let vari\'et\'es de Deligne Lusztig associ\'ees. M. Brou\'e et J. Michel, Novembre 1995. The files BrMi1.tex and BrMi2.tex replace the files previously named "lum...". There have been some changes and (hopefully) some improvements. The file BrMi2.dvi must be printed with the landscape option (" dvips -o landscape BrMi2.tex "). It corresponds to the tables of the main file, which come just before the reference.