Raina, B. L., and Nancy Kaul. “Certain Extended Rules for Numerical Integration”. Anal. Numér. Théor. Approx. 16, no. 2 (August 1, 1987): 159–166. Accessed December 25, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1987-vol16-no2-art9.