65Fundamental Units of Length and TimeFoundations of Physics 32 (1): 77-108. 2002.Ideal rods and clocks are defined as an infinitesimal symmetry of the spacetime, at least in the non-quantum case. Since no a priori geometric structure is considered, all the possible models of spacetime are obtained
Quaternions, Maxwell equations and Lorentz transformationsApeiron 12 371-384. 2005.