P. Johri, M. Shah, V. Shah, and P. Chandarana. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (3):
1113--1116(March 2015)
M. Zhang, and K. Chakrabarti. Proceedings of the 2013 ACM SIGMOD International Conference on Management of Data, page 145--156. New York, NY, USA, ACM, (2013)