@article{SM_1971_13_4_a3,
     author = {B. M. Shain},
     title = {Representation of ordered projection semigroups},
     journal = {Sbornik. Mathematics},
     pages = {552--568},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_13_4_a3/}
}