@article{ZNSL_1993_205_a7,
     author = {A. M. Nikitin},
     title = {On the spectrum of the averaging operator for a~finite homogeneous graph},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {92--109},
     year = {1993},
     volume = {205},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_205_a7/}
}