@article{1093888029, author = {Butrick, Richard}, title = {A deduction rule for ${\rm VBTO}($ $)^n\_{i=1}$.}, journal = {Notre Dame J. Formal Logic}, volume = {18}, number = {1}, year = {1977}, pages = { 510-512}, language = {en}, url = {http://dml.mathdoc.fr/item/1093888029} }
Butrick, Richard. A deduction rule for ${\rm VBTO}($ $)^n_{i=1}$.. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 510-512. http://gdmltest.u-ga.fr/item/1093888029/