Source: https://www.researchgate.net/profile/Mohamed-Khireddine-Kholladi/publication/236109339_SIG_pour_la_Gestion_des_Donnees_Sismiques_de_la_Region_de_Constantine_-_SismoSIG/links/0c96051602f97103a1000000/SIG-pour-la-Gestion-des-Donnees-Sismiques-de-la-Region-de-Constantine-SismoSIG.pdf