@article{MS2_1982__51_166804,
     author = {Ralph McKenzie and Bjarni J\'onsson},
     title = {Powers of partially ordered sets: {Cancellation} and reffinement properties.},
     journal = {Mathematica Scandinavica},
     pages = {87--120},
     publisher = {mathdoc},
     volume = {51},
     year = {1982},
     zbl = {0501.06001},
     url = {http://geodesic.mathdoc.fr/item/MS2_1982__51_166804/}
}