\input zb-basic
\input zb-ioport
\iteman{io-port 50303396}
\itemau{Abbas, Mujahid; Rhoades, B. E.; Nazir, Talat}
\itemti{Common fixed points for four maps in cone metric spaces}
\itemso{Applied Mathematics and Computation 216, No. 1, 80-86 (2010).}
\itemcc{}
\itemut{}
\itemli{doi:10.1016/j.amc.2010.01.003}
\end