@article{AM2_1977__15_136641,
     author = {Joel Berman},
     title = {Distributive lattices with an additional unary operation. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {118--118},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0395.06007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136641/}
}