1. Commuting maps and fixed points;Jungk;Am. Math. Monthly,1976
2. On a weak commutativity condition of mappings in fixed point consideration;Sessa;Publ. Inst. Math. Soc.,1982
3. Compatible mappings and common fixed points;Jungk;Int.J. Math. Sci.,1986
4. Common fixed points for noncontinuous nonself maps on nonmetric spaces;Jungk;Far East J. Math. Sci.,1996
5. Coincidence and common fixed point results for contraction type maps in partially ordered metric spaces;Aydi;Int. J. Math. Anal.,2011