Jakob Schwabedal, F. and Schwabedal, F.J. 2011. The Spatial Planning Instrument Eigenentwicklung A Methodical Comparison of the Stipulations in the Regional Development Plans in Lower Saxony (Germany). Raumforschung und Raumordnung | Spatial Research and Planning. 69, 1 (Feb. 2011), 17–28. DOI:https://doi.org/10.1007/s13147-010-0070-2.