An extension algebra and the modal system ${\rm T}$.
Lemmon, E. J.
Notre Dame J. Formal Logic, Tome 1 (1960) no. 1-2, p. 3-12 / Harvested from Project Euclid
Text on Project Euclid
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Publié le : 1960-05-14
Classification:  02.27 
@article{1093956424,
     author = {Lemmon, E. J.},
     title = {An extension algebra and the modal system ${\rm T}$.},
     journal = {Notre Dame J. Formal Logic},
     volume = {1},
     number = {1-2},
     year = {1960},
     pages = { 3-12},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093956424}
}

Lemmon, E. J. An extension algebra and the modal system ${\rm T}$.. Notre Dame J. Formal Logic, Tome 1 (1960) no. 1-2, pp.  3-12. http://gdmltest.u-ga.fr/item/1093956424/