@article {journals/tkde/PetridouKVP08,
	title = {Time-Aware Web Users{\textquoteright} Clustering},
	journal = {IEEE Trans. Knowl. Data Eng.},
	volume = {20},
	number = {5},
	year = {2008},
	pages = {653-667},
	author = {Petridou, Sophia G. and Vassiliki A. Koutsonikola and Athena Vakali and Papadimitriou, Georgios I.}
}