Popoviciu, Elena. “In Memoriam: In Memoriam”. Anal. Numér. Théor. Approx. 20, no. 1 (August 1, 1991): 3–9. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1991-vol20-nos1-2-art1.