Weber, Jörg, and Martin Sandtner. 1999. “The Use of Surface Structures in the Description of Urban Spaces: A Contribution to the Mapping, Analysis and Evaluation of Sustainable Yrban Development: The Example of Munich”. Raumforschung Und Raumordnung | Spatial Research and Planning 57 (5-6): 410–417. https://doi.org/10.1007/BF03184509.