Andrea Capiluppi Maurizio Morisio Patricia Lago Evolution of understanding in OSS projects. 58-68 2004 conf/csmr/2004 CSMR http://csdl.computer.org/comp/proceedings/csmr/2004/2107/00/21070058abs.htm db/conf/csmr/csmr2004.html#CapiluppiML04