Source: https://www.researchgate.net/profile/Kaouche-Soumeya-2/publication/290394026_Evaluation_des_contraintes_zootechniques_de_developpement_de_l'elevage_bovin_laitier_en_Algerie_cas_de_la_wilaya_de_Medea/links/5696a45208aec79ee32a08c4/Evaluation-des-contraintes-zootechniques-de-developpement-de-lelevage-bovin-laitier-en-Algerie-cas-de-la-wilaya-de-Medea.pdf