@article{MASLO_2006__56_5_a4,
     author = {Foulis, David J.},
     title = {Sharp and fuzzy elements of an {RC-group}},
     journal = {Mathematica slovaca},
     pages = {525--541},
     publisher = {mathdoc},
     volume = {56},
     number = {5},
     year = {2006},
     mrnumber = {2293585},
     zbl = {1141.06017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2006__56_5_a4/}
}