${\rm S}4.6$ is ${\rm S}4.9$.
Zeman, J. Jay
Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, / Harvested from Project Euclid
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Publié le : 1972-01-14
Classification:  02C10 
@article{1093894632,
     author = {Zeman, J. Jay},
     title = {${\rm S}4.6$ is ${\rm S}4.9$.},
     journal = {Notre Dame J. Formal Logic},
     volume = {13},
     number = {3},
     year = {1972},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093894632}
}

Zeman, J. Jay. ${\rm S}4.6$ is ${\rm S}4.9$.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, . http://gdmltest.u-ga.fr/item/1093894632/