@article{FAA_1985_19_4_a6,
     author = {V. B. Pilyugina and A. L. Fel'shtyn},
     title = {The {Nielsen} zeta function},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {61--67},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1985_19_4_a6/}
}