@article{RM_2002_57_2_a13,
     author = {V. A. Zorich and V. M. Kesel'man},
     title = {Fundamental frequency and conformal type of {a~Riemannian} manifold},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {428--429},
     publisher = {mathdoc},
     volume = {57},
     number = {2},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2002_57_2_a13/}
}