B. Jones, H. Benko, E. Ofek, и A. Wilson. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '13), Paris, France, стр. 869--878. New York, ACM, (2013)
C. Giles, K. Bollacker, и S. Lawrence. Proceedings of the Third ACM Conference on Digital Libraries, Pittsburgh, PA, USA, стр. 89--98. New York, NY, USA, ACM, (1998)