\input zb-basic
\input zb-ioport
\iteman{io-port 50221077}
\itemau{Chen, Reuven}
\itemti{Noniterative solution of some Fermat-weber location problems}
\itemso{Adv. Operations Research 2011 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1155/2011/379505}
\end