“…As TLS organizes events by date, timelines can be generated by MDS systems (such as (Radev et al, 2004b;Radev et al, 2004a;McKeown et al, 2003;Erkan and Radev, 2004;Metzler and Kanungo, 2008;Hong and Nenkova, 2014) by applying their summarization techniques on news articles for every individual date to create corresponding daily summaries. However, manually written timelines normally only include a small number of dates; in addition, the temporal component imposes constraints on sentence selection for timeline summarization, such as the preference for little overlap between sentences selected for different dates (Yan et al, 2011b).…”