On weak and strong validity of rules for the propositional calculus.
Rickey, V. Frederick
Notre Dame J. Formal Logic, Tome 12 (1971) no. 1, p. 115-116 / Harvested from Project Euclid
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Publié le : 1971-01-14
Classification:  02.12 
@article{1093894158,
     author = {Rickey, V. Frederick},
     title = {On weak and strong validity of rules for the propositional calculus.},
     journal = {Notre Dame J. Formal Logic},
     volume = {12},
     number = {1},
     year = {1971},
     pages = { 115-116},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093894158}
}

Rickey, V. Frederick. On weak and strong validity of rules for the propositional calculus.. Notre Dame J. Formal Logic, Tome 12 (1971) no. 1, pp.  115-116. http://gdmltest.u-ga.fr/item/1093894158/