@article{FPM_2012_17_3_a3,
     author = {Yu. V. Zhuchok},
     title = {Endomorphism semigroups of some free products},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {51--60},
     year = {2012},
     volume = {17},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2012_17_3_a3/}
}