Păltănea, Radu. “Une Classe générale d’opérateurs polynômiaux: A General Class of Polynomial Operators”. Anal. Numér. Théor. Approx. 17, no. 1 (February 1, 1988): 49–52. Accessed April 11, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1988-vol17-no1-art7.