@article{IVM_1986_1_a6,
     author = {\`E. G. Poznyak and E. V. Shikin},
     title = {Analytic tools of the theory of imbeddings of two-dimensional manifolds of negative curvature},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--60},
     publisher = {mathdoc},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_1_a6/}
}