@article{DA_1990_30_a3,
     author = {I. V. Grebennik and S. V. Yakovlev},
     title = {Extremal properties of quadratic functions with {Boolean} variables},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {30--34},
     publisher = {mathdoc},
     number = {30},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1990_30_a3/}
}