@article{GDZPPN001253115, title = {Semilattices of width 3 whose decomposable elements form a chain.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {201-240}, zbl = {0408.06001}, url = {http://dml.mathdoc.fr/item/GDZPPN001253115} }
Sirjaev, V.M. Semilattices of width 3 whose decomposable elements form a chain.. Semigroup forum, Tome 18 (1979) pp. 201-240. http://gdmltest.u-ga.fr/item/GDZPPN001253115/