@article{SM_2006_197_3_a4,
     author = {I. A. Cheltsov},
     title = {Factoriality of nodal three-dimensional varieties and connectedness of the locus of log canonical singularities},
     journal = {Sbornik. Mathematics},
     pages = {387--414},
     publisher = {mathdoc},
     volume = {197},
     number = {3},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_3_a4/}
}