Source: https://www.researchgate.net/profile/Chouder-Aissa/publication/236109221_Conception_et_Realisation_d'un_Systeme_de_Chauffe-eau_Solaire_Photovoltaique/links/0c9605160238bc0d04000000/Conception-et-Realisation-dun-Systeme-de-Chauffe-eau-Solaire-Photovoltaique.pdf