\input zb-basic
\input zb-ioport
\iteman{io-port 70824449}
\itemau{Carnes, Tim; Shmoys, David B.}
\itemti{Primal-dual schema and Lagrangian relaxation for the k-location-routing problem}
\itemso{APPROX-RANDOM, 99-110 (2011).}
\itemcc{}
\itemut{}
\itemli{doi:10.1007/978-3-642-22935-0\_9}
\end