1. 1) Jensen, A. B. O., Zabic, M., Overø, H. M. and Nielsen, O. A.: Availability of GNSS for Road Pricing in Copenhagen, ION GNSS 2005, Long Beach, California, USA, 2005, pp. 2951–2961.
2. 2) Stone, J. M. and Powell, J. D.: Precise Positioning with GPS Near Obstructions by Augmentation with Pseudolites, Position Location and Navigation Symposium, IEEE 1998, 20–23 April 1998, pp. 562–569.
3. 3) Konishi, Y. and Shibasaki, R.: Development of a Simulation System to Estimate Available Area of GPS and Pseudolite, 22nd Asian Conference on Remote Sensing, Singapore, 5–9 November 2001.
4. 4) Hakamata, T., Konishi, Y., Suh, Y. and Shibasaki, R.: Development of a Simulation System to Delineate Availability of GNSS with 3-D Digital Map, Asian Conference on Remote Sensing, Session. GIS GPS & Data Integration, 2002.
5. 5) Suh, Y., Konish, Y., Hakamata, T. and Shibasaki, R.: The Effect of Quasi-Zenith Satellite System in Urban Environments, Geoinformation Student Forum Japan 2003.