I. Guerrero-Moreno, G. Leija-Hernández, José Luis Lopez-Bonilla, Rotations in Minkowski Spacetime, BSMaSS Volume 11, The Bulletin of Society for Mathematical Services and Standards (Volume 11)
    With the relation of Olinde Rodrigues-Cartan is obtained an expression for the Lorentz matrix, and it is transformed to a better form for the Newman-Penrose formalism, thus it is possible to realize rotations of the null tetrad of NP.
    Lorentz Matrix, Null Tetrad of Newman-Penrose