Mårten Pettersson Dave Randall Bo Helgeson Ambiguities, Awareness and Economy: A Study of Emergency Service Work. 125-154 2004 13 Computer Supported Cooperative Work 2 http://www.springerlink.com/index/10.1023/B:COSU.0000045707.37815.d1 db/journals/cscw/cscw13.html#PetterssonRH04