@article{FPM_2012_17_2_a5,
     author = {D. Z. Kagan},
     title = {Pseudocharacters on free groups, invariant with respect to some types of endomorphisms},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {167--176},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_2_a5/}
}