@article{VSGU_2009_8_a0,
     author = {E. P. Davletyarova and A. A. Zhukova and A. A. Yudin},
     title = {On maximal set without parallelograms},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {5--14},
     publisher = {mathdoc},
     number = {8},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2009_8_a0/}
}