Cobzaş, Ş. “Antiproximinal Sets in Banach Spaces of \(c_0\)-Type”. Anal. Numér. Théor. Approx. 7, no. 2 (August 1, 1978): 141–145. Accessed November 21, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1978-vol7-no2-art3.