http://tele-ens.univ-oeb.dz/moodle/pluginfile.php/441662/course/summary/Chapitre%202-%20G%C3%A9ologie%20de%20lAtlas%20tellien.pdf
http://tele-ens.univ-oeb.dz/moodle/pluginfile.php/441661/course/summary/Chap1-G%C3%A9n%C3%A9ralit%C3%A9s%20du%20Nord%20de%20l%E2%80%99Alg%C3%A9rie.pdf