@article{AUPO_2006__45_1_a14,
     author = {\v{S}vr\v{c}ek, Filip},
     title = {Additive closure operators on abelian unital $l$-groups},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {153--158},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2006},
     mrnumber = {2321307},
     zbl = {1125.06014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2006__45_1_a14/}
}