Bouarroudj, Nadra, Lekhmissi Belaib, and Bekkai Messirdi. “New Interpretation of Elliptic Boundary Value Problems via Invariant Embedding Approach and Yosida Regularization.”. Proyecciones (Antofagasta, On line) 37, no. 4 (November 22, 2018): 749-764. Accessed April 26, 2024. https://www.revistaproyecciones.cl/index.php/proyecciones/article/view/3278.