@article{TMF_1999_118_3_a3,
     author = {D. I. Borisov and R. R. Gadyl'shin},
     title = {On the spectrum of the {Laplacian} with frequently alternating boundary conditions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {347--353},
     publisher = {mathdoc},
     volume = {118},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_118_3_a3/}
}