@article{MAN_1981__258_163595,
     author = {Klaus Timmerscheidt},
     title = {On {Deformations} of  {Threedimensional} {Rational} {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {267--276},
     publisher = {mathdoc},
     volume = {258},
     year = {1981},
     zbl = {0489.14018},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__258_163595/}
}