Dumitrescu, Dan-Florin. “A Cubature Formula for a Bi-Dimensional Domain of a Trapezoidal Form”. Rev. Anal. Numér. Théor. Approx. 22, no. 2 (August 1, 1993): 161–172. Accessed May 2, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1993-vol22-no2-art5.