@article{DBLP:journals/tods/FanGW12, author = {Wenfei Fan and Floris Geerts and Jef Wijsen}, title = {Determining the Currency of Data}, journal = {ACM Trans. Database Syst.}, volume = {37}, number = {4}, year = {2012}, pages = {25}, ee = {http://doi.acm.org/10.1145/2389241.2389244}, bibsource = {DBLP, http://dblp.uni-trier.de} }