@article{ZNSL_2013_419_a8,
     author = {L. Yu. Kolotilina},
     title = {Bounds for the largest two eigenvalues of the signless {Laplacian}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {139--153},
     publisher = {mathdoc},
     volume = {419},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_419_a8/}
}