1. C. Castro and M. Pavsic, The Extended Relativity Theory in Clifford-spaces. Progress in Physics vol. 1 (2005) 31; Phys. Letts B 559 (2003) 74; Int. J. Theor. Phys 42 (2003) 1693.
2. C. Castro, The Extended Relativity Theory in Clifford Phase Spaces and Modifications of Gravity at the Planck/Hubble scales. To appear in Advances in Applied Clifford Algebras.
3. M. Pavsic, Found. of Phys. 33 (2003), 1277. M. Pavsic, The Landscape of Theoretical Physics : A Global View, from point particles to the brane world and beyond, in search of a Unifying Principle. (Fundamental Theories of Physics, vol. 19, Kluwer Academic Publishers, Dordrecht, Boston, London, 2001).
4. C. Castro, Novel Physical Consequences of the Extended Relativity in Clifford Spaces. To appear in Advances in Applied Clifford Algebras.
5. C. Castro, Superluminal particles and the Extended Relativity Theories. Foundations of Physics vol 42 issue 9 (2012), 1135.