Harikrishnan, P.K., Bernardo Lafuerza–Guill´en, Yeol Je Cho, and K.T. Ravindran. 2020. “Fixed Point Theorem for Contraction Mappings in Probabilistic Normed Spaces”. Italian Journal of Pure and Applied Mathematics 43 (February):818-27. https://journals.uniurb.it/index.php/ijpam/article/view/7288.