@article{AUPO_2003_42_1_a0,
     author = {B\v{e}lohl\'avek, Radim},
     title = {Boolean part of {BL-algebras}},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {7--11},
     year = {2003},
     volume = {42},
     number = {1},
     mrnumber = {2056017},
     zbl = {1053.03042},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_2003_42_1_a0/}
}