F. Jaafri, Fatna, Abdesslem Ayoujil, and Mohamed Berrajaa. 2021. “On a Bi-Nonlocal Fourth Order Elliptic Problem”. Proyecciones (Antofagasta, On Line) 40 (1):239-53. https://doi.org/10.22199/issn.0717-6279-2021-01-0015.