Tractability of Cut-free Gentzen-type propositional calculus with permutation inference II.

Noriko H. Arai Tractability of Cut-free Gentzen-type propositional calculus with permutation inference II. 185-197 2000 243 Theor. Comput. Sci. 1-2 db/journals/tcs/tcs243.html#Arai00a http://dx.doi.org/10.1016/S0304-3975(98)00186-8