ISBN 978-1-58465-512-1* Heiner Benking (1993), Visual Access Strategies for Multi-Dimensional Objects and Issues / "Our View of Life is too Flat", WFSF, Turku, FAW Report TR-93019* William S. Cleveland (1993).
ISBN 978-1584655121* Heiner Benking (1993), Visual Access Strategies for Multi-Dimensional Objects and Issues / "Our View of Life is too Flat", WFSF, Turku, FAW Report TR-93019* William S. Cleveland (1993).