@article{ADM_2012_14_2_a5,
     author = {S. A. Kruglyak and I. V. Livinsky},
     title = {Orthoscalar representations of the partially ordered set $(N, 4)$},
     journal = {Algebra and discrete mathematics},
     pages = {217--229},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2012_14_2_a5/}
}