A. Halevy, M. Franklin, and D. Maier. Proceedings of the twenty-fifth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems, page 1--9. New York, NY, USA, ACM, (2006)
D. Pinelle, N. Wong, and T. Stach. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 1453--1462. New York, NY, USA, ACM, (2008)