@article{JMAG_2002_9_3_a15,
     author = {T. O. Kononovich},
     title = {The lower bounds estimate of the best approximation with a trigonometric polynomials of a summarized functions of two variables},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {478--486},
     year = {2002},
     volume = {9},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2002_9_3_a15/}
}