@article{ZNSL_1985_143_a8,
     author = {V. B. Pilyugina and A. L. Fel'shtyn},
     title = {Nielsen zeta-function},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {156--161},
     publisher = {mathdoc},
     volume = {143},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_143_a8/}
}