Bantaş, G., and C. Corduneanu. “Tiberiu Popoviciu - Professor at the University of Iași”. Rev. Anal. Numér. Théor. Approx., vol. 21, no. 1, Feb. 1992, pp. 103-4, https://ictp.acad.ro/jnaat/journal/article/view/1992-vol21-no1-art1.