Şoltuz, Ştefan M. “Inverse Problems via Generalized Contractive Type Operators”.
Rev. Anal. Numér. Théor. Approx.
39, no. 2 (August 1, 2010): 164–168. Accessed April 8, 2025.
https://ictp.acad.ro/jnaat/journal/article/view/2010-vol39-no2-art8
.