Popoviciu, Elena. “Sur Un théorème De La Moyenne: On a Mean Value Theorem”. Anal. Numér. Théor. Approx. 9, no. 1 (February 1, 1980): 107–112. Accessed November 22, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1980-vol9-no1-art14.