@article{1093888117, author = {Slaght, Ralph L.}, title = {Modal tree constructions.}, journal = {Notre Dame J. Formal Logic}, volume = {18}, number = {1}, year = {1977}, pages = { 517-526}, language = {en}, url = {http://dml.mathdoc.fr/item/1093888117} }
Slaght, Ralph L. Modal tree constructions.. Notre Dame J. Formal Logic, Tome 18 (1977) no. 1, pp. 517-526. http://gdmltest.u-ga.fr/item/1093888117/