Data on Retention. - Ward van Wanrooij; Aiko Pras (DSOM, 2005)

Scheduling Feed Retrieval. - Ward van Wanrooij; Aiko Pras (ICC, 2007)

Filtering spam from bad neighborhoods. - Ward van Wanrooij; Aiko Pras (Int. J. Netw. Manag., 2010)