@article{TRSPY_1980_152_a9,
     author = {V. S. Makarov and I. S. Gutsul},
     title = {Noncompact three-dimensional manifolds of constant negative curvature that have finite measure},
     journal = {Informatics and Automation},
     pages = {165--169},
     publisher = {mathdoc},
     volume = {152},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1980_152_a9/}
}