Linear systems representing threefolds which are scrolls on a rational surface
arXiv:math/9811083
Abstract
Let X be a scroll over a rational surface. We construct a linear system of surfaces in P^3 yielding a birational map from P^3 to X. We apply this construction to the scrolls of Bordiga and Palatini.
14 pages, Plain-TeX, to be published in Collectanea Mathematica