@article{YJOR_2011_21_2_a6,
     author = {Miroslav Hudec},
     title = {Fuzzy {Improvement} of the {SQL}},
     journal = {Yugoslav journal of operations research},
     pages = {239 },
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/YJOR_2011_21_2_a6/}
}