Source: http://www.btscm.fr/dicocm/C/chantier/PoleAero/index/Gros%20oeuvre/Pieux%20et%20Recepage/KELLER/www.keller-france.com/techniques/articles/Article%20Travaux%20-%20Mai%202011%20-%20Renforcement%20de%20sol%20sous%20r%C3%A9servoirs%20GNL%203Z%20%C3%A0%20Arzew.pdf