@article{1093956874, author = {Smiley, Timothy}, title = {On \L\ ukasiewicz's ${\rm \L}$-modal system.}, journal = {Notre Dame J. Formal Logic}, volume = {2}, number = {1}, year = {1961}, pages = { 149-153}, language = {en}, url = {http://dml.mathdoc.fr/item/1093956874} }
Smiley, Timothy. On Ł ukasiewicz's ${\rm \L}$-modal system.. Notre Dame J. Formal Logic, Tome 2 (1961) no. 1, pp. 149-153. http://gdmltest.u-ga.fr/item/1093956874/