@article{TRSPY_1980_152_a4,
     author = {I. S. Gutsul},
     title = {Compact three-dimensional manifolds of constant negative curvature},
     journal = {Informatics and Automation},
     pages = {89--96},
     publisher = {mathdoc},
     volume = {152},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1980_152_a4/}
}