The number of nonnormal extensions of ${\rm S4}$.
Schumm, George F.
Notre Dame J. Formal Logic, Tome 28 (1987) no. 1, p. 106-108 / Harvested from Project Euclid
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Publié le : 1987-12-14
Classification:  03B45 
@article{1093637775,
     author = {Schumm, George F.},
     title = {The number of nonnormal extensions of ${\rm S4}$.},
     journal = {Notre Dame J. Formal Logic},
     volume = {28},
     number = {1},
     year = {1987},
     pages = { 106-108},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093637775}
}

Schumm, George F. The number of nonnormal extensions of ${\rm S4}$.. Notre Dame J. Formal Logic, Tome 28 (1987) no. 1, pp.  106-108. http://gdmltest.u-ga.fr/item/1093637775/