@article{FORUM_1992__4_6_141679,
     author = {Fred Richman and David M. Arnold},
     title = {Field-independent representations of partially ordered sets.},
     journal = {Forum mathematicum},
     pages = {349--358},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1992},
     zbl = {0763.06001},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1992__4_6_141679/}
}