@article{ZNSL_2013_419_a0,
     author = {Yu. A. Al'pin},
     title = {Harary's theorem on signed graphs and reversibility of {Markov} chains},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--15},
     publisher = {mathdoc},
     volume = {419},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_419_a0/}
}