@ARTICLE{
author={Brimberg Jack,Mladenovic Nenad M,Urosevic Dragan B,Ngai Eric},
year={2009},
title={Variable neighborhood search for the heaviest k-subgraph},
journal={COMPUTERS & OPERATIONS RESEARCH},
volume={36},
number={11},
pages={2885-2891},
document_type={Article},
} 

@ARTICLE{
author={Hansen P,Ngai Eric,Cheung BK,Mladenovic Nenad M},
year={2005},
title={Analysis of global k-means, an incremental heuristic for minimum sum-of-squares clustering},
journal={JOURNAL OF CLASSIFICATION},
volume={22},
number={2},
pages={287-310},
document_type={Article},
}