@article{ZNSL_1993_205_a10,
     author = {A. M. Nikitin},
     title = {The primitive cohjugacy classes and the generalized homology group of finite graph},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {154--165},
     publisher = {mathdoc},
     volume = {205},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_205_a10/}
}