S. STAMBOULI-ESSASSI, M. ZAKRAOUI, S. BOUZID, and F. HARZALLAH-SKHIRI, “Sexual Propagation of the Tunisian Spinescent Opuntia ficus-indica (L.) Mill., Morphogenetic Deployment and Polymorphism”, Not Bot Horti Agrobo, vol. 45, no. 1, pp. 50–58, Jun. 2017.