G. Lee, S. Kang, and J. Whang. Proceedings of the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval, ACM, (July 2019)
D. Gibson, J. Kleinberg, and P. Raghavan. Proceedings of the ninth ACM conference on Hypertext and hypermedia : links, objects, time and space---structure in hypermedia systems links, objects, time and space---structure in hypermedia systems - HYPERTEXT \textquotesingle98, ACM Press, (1998)
D. Liben-Nowell, and J. Kleinberg. Proceedings of the twelfth international conference on Information and knowledge management - CIKM \textquotesingle03, ACM Press, (2003)