Lupaş, Luciana. “Linear Positive Operators on the Space \(AC_m\)”. Anal. Numér. Théor. Approx. 6, no. 2 (August 1, 1977): 139–143. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1977-vol6-no2-art5.