An Optimal Algorithm for Approximating a Set of Rectangles by Two Minimum Area Rectangles. - Bruno Becker; Paolo Giulio Franciosa; Stephan Gschwind; Thomas Ohler; Gerald Thiemt; Peter Widmayer (Workshop on Computational Geometry, 1991)

Enclosing Many Boxes by an Optimal Pair of Boxes. - Bruno Becker; Paolo Giulio Franciosa; Stephan Gschwind; Thomas Ohler; Gerald Thiemt; Peter Widmayer (STACS, 1992)

A Brief Tutorial Introduction to Data Structures for Geometric Databases. - Thomas Ohler; Peter Widmayer (CISM - Advances in Database Systems, 1993)

Data Structures and Algorithms for Geographic Information Systems: Selected Topics. - Thomas Ohler; Peter Widmayer (CISM - Advances in Database Systems, 1993)

Geographic Information Systems: An Example. - Thomas Ohler; Peter Widmayer (CISM - Advances in Database Systems, 1993)

On Optimal Multiversion Access Structures. - Bruno Becker; Stephan Gschwind; Thomas Ohler; Bernhard Seeger; Peter Widmayer (SSD, 1993)

VisTool: A Visualization Tool for Spatial Access Structures. - Viet Hai Nguyen; Thomas Ohler; Peter Widmayer (IGIS, 1994)

COSIMA, A Network Based Architecture for GIS. - Andreas Wolf; Michele De Lorenzi; Thomas Ohler; Viet Hai Nguyen (IGIS, 1994)

Enclosing a Set of Objects by Two Minimum Area Rectangles. - Bruno Becker; Paolo Giulio Franciosa; Stephan Gschwind; Stefano Leonardi 001; Thomas Ohler; Peter Widmayer (J. Algorithms, 1996)

An Asymptotically Optimal Multiversion B-Tree. - Bruno Becker; Stephan Gschwind; Thomas Ohler; Bernhard Seeger; Peter Widmayer (VLDB J., 1996)

The Alps at Your Fingertips: Virtual Reality and Geoinformation Systems. - Renato Pajarola; Thomas Ohler; Peter Stucki; Kornél Szabó; Peter Widmayer (ICDE, 1998)