B. S. Choudhury, S. K. Bhandari & P. Saha. (1970). A Cyclic Probabilistic $C$-Contraction Results Using Hadzic and Lukasiewicz $T$-Norms in Menger Spaces.
            <i>Analysis in Theory and Applications</i>. <i>31</i> (3).
            283-298.
         doi:10.4208/ata.2015.v31.n3.6