1. Abolfathi M, Amirfattahi R (2010) Design and implementation of a reliable and authenticated satellite image communication. Telecommun Syst. doi: 10.1007/s11235-010-9366-3
2. Airport Integrated Mapping System (AIMS) (2003) CADD & GIS Data Accuracy Specification. SJC-ACM-AIMS-2611
3. Bourke P (2011) Calculating the area and centroid of a polygon. http://local.wasp.uwa.edu.au/pbourke/geometry/polyarea/ . Accessed 20 Feb 2011
4. Buckey DJ (2011) Bgis introduction to GIS. http://bgis.sanbi.org/gis-primer/index.htm . Accessed on Jul 2011
5. Differential geometry of curves. http://en.wikipedia.org/wiki/ . Accessed 20 Feb 2011