Glenn Bruns Radha Jagadeesan Alan Jeffrey James Riely µABC: A Minimal Aspect Calculus. 209-224 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3170&spage=209 2004 conf/concur/2004 CONCUR db/conf/concur/concur2004.html#BrunsJJR04