The Invar tensor package. - José M. Martín-García; Renato Portugal; Leon R. U. Manssur (Comput. Phys. Commun., 2007)

xPerm: fast index canonicalization for tensor computer algebra. - José M. Martín-García (Comput. Phys. Commun., 2008)

The Invar tensor package: Differential invariants of Riemann. - José M. Martín-García; David Yllanes; Renato Portugal (Comput. Phys. Commun., 2008)

Spinors: A Mathematica package for doing spinor calculus in General Relativity. - Alfonso García-Parrado Gómez-Lobo; José M. Martín-García (Comput. Phys. Commun., 2012)