2Herbert Landau, Ulrich Vollath, Xiaoming Chen Virtual Reference Station Systems Journal of Global Positioning Systems (2002) Vol. 1, No. 2:137-143
3Vollath, U. , H. Landau, X. Chen (2002) Network RTK versus Single Base RTK-UndXerstanding the Error Characteristics, Proceedings of the 15th International-Technical Meeting of the Satellite Division of the Institute of Navigation, Portland,Oregon, USA, September 2002
