Venkatesan T. Chakaravarthy Vinayaka Pandit Sambuddha Roy Pranjal Awasthi Mukesh K. Mohania Decision trees for entity identification: approximation algorithms and hardness results. 53-62 2007 conf/pods/2007 PODS http://doi.acm.org/10.1145/1265530.1265538 db/conf/pods/pods2007.html#ChakaravarthyPRAM07