%0 Journal Article %A N. V. Timofeeva %T The variety of complete pairs of zero-dimensional subschemes of length 2~of a~smooth three-dimensional variety is singular %J Sbornik. Mathematics %D 2003 %P 361-368 %V 194 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2003_194_3_a2/ %G en %F SM_2003_194_3_a2