Source: https://www.researchgate.net/profile/Hamza_Benkhedda/publication/334109127_qrat_fy_ahm_mstjdat_alaslah_aljdhry_llqanwn_almdny_alfrnsy_lsnt_2016_wmdy_tathyrha_ly_alqanwn_almdny_aljzayry_fy_thwbh_alhaly/links/5d17535a92851cf440552a50/qrat-fy-ahm-mstjdat-alaslah-aljdhry-llqanwn-almdny-alfrnsy-lsnt-2016-wmdy-tathyrha-ly-alqanwn-almdny-aljzayry-fy-thwbh-alhaly.pdf