S. M. Ali. (1970). More on Fixed Point Theorem of $\{a,b,c\}$-Generalized Nonexpansive Mappings in Normed Spaces.
            <i>Analysis in Theory and Applications</i>. <i>29</i> (1).
            1-11.
         doi:10.4208/ata.2013.v29.n1.1