A common fixed point theorem
Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 265-266. 
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     author = {Rhoades, B. E.},
     title = {A common fixed point theorem},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {265--266},
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     volume = {56},
     year = {1976},
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     url = {http://archive.numdam.org/item/RSMUP_1976__56__265_0/}
}
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Rhoades, B. E. A common fixed point theorem. Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 265-266. http://archive.numdam.org/item/RSMUP_1976__56__265_0/

[1] K. Iseki, A Common Fixed Point Theorem, Rend. Sem. Mat. Padova, 53 (1975), pp. 13-14. | Numdam | MR 407825 | Zbl 0323.54040

[2] B.E. Rhoades, A Comparison od Various Definitions of Contractive Mappings, Trans. Amer. Math. Soc. 226 (1977) pp. 257-290. | MR 433430 | Zbl 0365.54023