Canonical Signed Calculi, Non-deterministic Matrices and Cut-Elimination.

Arnon Avron Anna Zamansky Canonical Signed Calculi, Non-deterministic Matrices and Cut-Elimination. 31-45 2009 LFCS http://dx.doi.org/10.1007/978-3-540-92687-0_3 conf/lfcs/2009 db/conf/lfcs/lfcs2009.html#AvronZ09