Two- versus three-dimensional connectivity testing of first-order queries to semi-algebraic sets - Floris Geerts; Lieven Smits; Jan Van den Bussche (CoRR, 2003)

N-dimensional versus (N-1)-dimensional connectivity testing of first-order queries to semi-algebraic sets. - Floris Geerts; Lieven Smits; Jan Van den Bussche (Acta Informatica, 2005)