Approximation of Octilinear Steiner Trees Constrained by Hard and Soft Obstacles. - Matthias Müller-Hannemann; Anna Schulze (SWAT, 2006)

Hardness and Approximation of Octilinear Steiner Trees. - Matthias Müller-Hannemann; Anna Schulze (Int. J. Comput. Geom. Appl., 2007)

A Simple 3-Approximation of Minimum Manhattan Networks. - Bernhard Fuchs; Anna Schulze (CTW, 2008)

Case Studies. - Daniel Delling; Roberto Hoffmann; Maria Kandyba; Anna Schulze (Algorithm Engineering, 2010)