@article{Vallet:2011,
 author = {David Vallet and Hopfgartner, Frank and Jose, Joemon M. and Castells, Pablo},
 title = {Effects of Usage based Feedback on Video Retrieval: a Simulation based Study},
 journal = {ACM Transactions on Information Systems},
 year = {2011},
 volume = {29},
 number = {2}, 
 url = {http://dx.doi.org/10.1145/1961209.1961214}
 }