@article{CMJ_2008__58_1_a12,
     author = {Jakub{\'\i}k, J\'an},
     title = {Direct summands and retract mappings of generalized $MV$-algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {183--202},
     publisher = {mathdoc},
     volume = {58},
     number = {1},
     year = {2008},
     mrnumber = {2402534},
     zbl = {1174.06319},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008__58_1_a12/}
}