@article{SF_1984__30_134702,
     author = {T. Tamura},
     title = {On chains whose power semigroups are lattices.},
     journal = {Semigroup forum},
     pages = {35--40},
     year = {1984},
     volume = {30},
     zbl = {0528.06002},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134702/}
}