@article{MZM_2006_80_6_a12,
     author = {D. V. Gorbachev and M. V. Zakharova},
     title = {On an extremal problem for periodic functions with small support},
     journal = {Matemati\v{c}eskie zametki},
     pages = {940--942},
     publisher = {mathdoc},
     volume = {80},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_6_a12/}
}