On the necessity of ${\rm S}4$.
Wiredu, Kwasi
Notre Dame J. Formal Logic, Tome 20 (1979) no. 1, p. 689-694 / Harvested from Project Euclid
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Publié le : 1979-07-14
Classification:  03B45 
@article{1093882679,
     author = {Wiredu, Kwasi},
     title = {On the necessity of ${\rm S}4$.},
     journal = {Notre Dame J. Formal Logic},
     volume = {20},
     number = {1},
     year = {1979},
     pages = { 689-694},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093882679}
}

Wiredu, Kwasi. On the necessity of ${\rm S}4$.. Notre Dame J. Formal Logic, Tome 20 (1979) no. 1, pp.  689-694. http://gdmltest.u-ga.fr/item/1093882679/