Reference:

Kai Puolamäki and Leila Koivisto, editors. Biennial report 2002–2003. Laboratory of Computer and Information Science, 2004.

Suggested BibTeX entry:

@book{Puolamaki04biennial,
    editor = {Kai Puolam\"aki and Leila Koivisto},
    publisher = {Laboratory of Computer and Information Science},
    title = {Biennial report 2002--2003},
    year = {2004},
}