@article{GDZPPN001252577, title = {Tietze's convexity theorey for lattices and semilattices.}, journal = {Semigroup forum}, volume = {14}, year = {1977}, pages = {357-374}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN001252577} }
Jamison, R. E. Tietze's convexity theorey for lattices and semilattices.. Semigroup forum, Tome 14 (1977) pp. 357-374. http://gdmltest.u-ga.fr/item/GDZPPN001252577/