Şoltuz, Ştefan M. “Inverse Problems via Generalized Contractive Type Operators”. Rev. Anal. Numér. Théor. Approx. 39, no. 2 (August 1, 2010): 164–168. Accessed December 6, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2010-vol39-no2-art8.