@article{FAA_2013_47_3_a7,
     author = {D.I. Borisov and K. V. Pankrashin},
     title = {On the {Extrema} of {Band} {Functions} in {Periodic} {Waveguides}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {87--90},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2013_47_3_a7/}
}