@article{CMJ_2008__58_4_a9,
     author = {Dudek, Wies{\l}aw A. and Trokhimenko, Valentin S.},
     title = {Projection representable relations on {Menger} $(2,n)$-semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1015--1037},
     publisher = {mathdoc},
     volume = {58},
     number = {4},
     year = {2008},
     mrnumber = {2471162},
     zbl = {1165.20324},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008__58_4_a9/}
}