SHATANAWI, Wasfi. Fixed and common fixed point theorems in frame of quasi metric spaces under contraction condition based on ultra distance functions. Nonlinear Analysis: Modelling and Control, [S. l.], v. 23, n. 5, p. 724–748, 2018. DOI: 10.15388/NA.2018.5.6. Disponível em: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/13161. Acesso em: 26 apr. 2025.