@article{PORMA_1998__55_2_48125,
     author = {Priestley, H.A. and Santos, R.},
     title = {Varieties of distributive lattices with unary operations. {II.}},
     journal = {Portugaliae mathematica},
     pages = {135--166},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1998},
     zbl = {0912.06009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1998__55_2_48125/}
}