The paper is available in several formats.

Bibtex entry:

@TECHREPORT{bcs-2002,
AUTHOR = "Karl Lieberherr and David Lorenz and Johan Ovlinger",
TITLE = "Aspectual Collaborations: Modular Aspects for Collaboration-Oriented Concerns",
YEAR = "2002",
INSTITUTION  = "College of Computer Science, Northeastern University",
YEAR         = 2002,
MONTH        = "March",
NUMBER       = "{NU-CCS-02-?}",
ADDRESS      = "Boston, MA",
NOTE="http://www.ccs.neu.edu/research/demeter/papers/bcs-2002"
}