Stergos D. Afantenos Vangelis Karkaletsis Panagiotis Stamatopoulos Constantin Halatsis Using synchronic and diachronic relations for summarizing multiple documents describing evolving events. 183-226 2008 30 J. Intell. Inf. Syst. 3 http://dx.doi.org/10.1007/s10844-006-0025-9 db/journals/jiis/jiis30.html#AfantenosKSH08