@article{10_2298_PIM0795053K,
     author = {Aleksandar Krape\v{z}},
     title = {Quadratic {Level} {Quasigroup} {Equations} {With} {Four} {Variables} {I}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {53 },
     publisher = {mathdoc},
     volume = {_N_S_81},
     number = {95},
     year = {2007},
     doi = {10.2298/PIM0795053K},
     zbl = {1229.39035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/PIM0795053K/}
}