Jean-Marc Andreoli Laurent Mazaré Concurrent Construction of Proof-Nets. 29-42 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2803&spage=29 2003 conf/csl/2003 CSL db/conf/csl/csl2003.html#AndreoliM03