@article{SM_2003_194_3_a2,
     author = {N. V. Timofeeva},
     title = {The variety of complete pairs of zero-dimensional subschemes of length 2~of a~smooth three-dimensional variety is singular},
     journal = {Sbornik. Mathematics},
     pages = {361--368},
     publisher = {mathdoc},
     volume = {194},
     number = {3},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_3_a2/}
}