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B. Coll, J. J. Ferrando and J. A. Morales, “Two-Dimensional Approach to Relativistic Positioning Systems,” Physical Review D, Vol. 73, No. 8, 2006, Article ID: 084 017. doi:10.1103/PhysRevD.73.084017

has been cited by the following article:

• TITLE: Relativistic versus Newtonian Frames

  AUTHORS: J.-F. Pascual-Sánchez, A. San Miguel, F. Vicente

  KEYWORDS: Null Emission Coordinates; Location Systems; Causal Class; Relativistic Positioning System; Gravimetry

  JOURNAL NAME: Positioning, Vol.4 No.1, February 28, 2013

  ABSTRACT: Only a causal class among the 199 Lorentzian ones, which do not exists in the Newtonian space-time, is privileged to construct a generic, gravity free and immediate (non retarded) relativistic positioning system. This is the causal class of the null emission coordinates. Emission coordinates are defined and generated by four emitters broadcasting their proper times. The emission coordinates are covariant (frame independent) and hence valid for any user. Any observer can obtain the values of his (her) null emission coordinates from the emitters which provide him his (her) position and trajectory.