@article{1093890822, author = {Zuckerman, Martin M.}, title = {Formation sequences for propositional formulas.}, journal = {Notre Dame J. Formal Logic}, volume = {14}, number = {1}, year = {1973}, pages = { 134-138}, language = {en}, url = {http://dml.mathdoc.fr/item/1093890822} }
Zuckerman, Martin M. Formation sequences for propositional formulas.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 134-138. http://gdmltest.u-ga.fr/item/1093890822/