@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/