Şoltuz, Ştefan M. “Solving Inverse Problems via Weak Contractive Maps”. Rev. Anal. Numér. Théor. Approx. 37, no. 2 (August 1, 2008): 217–220. Accessed April 20, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2008-vol37-no2-art14.