@article{PIM_2014_N_S_95_109_a7,
     author = {Silvia Ghilezan and Jovanka Pantovi\'c and Gradimir Vojvodi\'c},
     title = {Binary {Relations} and {Algebras} on {Multisets}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {111 },
     publisher = {mathdoc},
     volume = {_N_S_95},
     number = {109},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2014_N_S_95_109_a7/}
}