Popoviciu, Elena. “Observations Sur La Notion De convexité: Observations on the Notion of Convexity”. Anal. Numér. Théor. Approx. 4, no. 2 (August 1, 1975): 157–159. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1975-vol4-no2-art6.