@article{ZNSL_1986_155_a8,
     author = {M. Yu. Lyubich and V. V. Suvorov},
     title = {On free subgroups of $SL(2,\mathbb C)$ with two parabolic generators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {150--155},
     publisher = {mathdoc},
     volume = {155},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_155_a8/}
}