@article{MZM_2014_96_6_a7,
     author = {A. T. Diab and P. A. Kuleshov and O. M. Penkin},
     title = {Estimate of the {First} {Eigenvalue} of the {Laplacian} on a {Graph}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {885--895},
     publisher = {mathdoc},
     volume = {96},
     number = {6},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2014_96_6_a7/}
}