Source: https://www.researchgate.net/profile/Louendi_Fatmi/publication/265817782_Effet_du_cyclage_sur_le_comportement_mecanique_et_la_morphologie_du_polythylene_haute_densite_PEHD_80/links/55fa96b208ae07629e03565d/Effet-du-cyclage-sur-le-comportement-mecanique-et-la-morphologie-du-polythylene-haute-densite-PEHD-80.pdf