Cocârlan, Paul. “Intégrales ultrasingulières: Ultrasingular Integrals”. Anal. Numér. Théor. Approx. 11, no. 1 (August 1, 1982): 35–40. Accessed November 24, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1982-vol11-nos1-2-art4.