%0 Journal Article %A D.I. Borisov %T Absence of gaps in a lower part of the spectrum of a Laplacian with frequent alternation of boundary conditions in a strip %J Teoretičeskaâ i matematičeskaâ fizika %D 2018 %P 225-239 %V 195 %N 2 %U http://geodesic.mathdoc.fr/item/TMF_2018_195_2_a4/ %G ru %F TMF_2018_195_2_a4