Solutions of the central Woods-Saxon potential in l ≤ 0 case using mathematical modification method. Pahlavani, M.R., Sadeghi, J., Ghezelbash, M. (2009) APPS. Applied Sciences
Some remarks on conservative symmetric-hyperbolic systems governing relativistic theories Alberto Strumia (1983) Annales de l'I.H.P. Physique théorique
Study of nonlinear wave processes in plasmas using the formalism of a special Lorentz transformation for a space-independent frame. Paul, S.N., Chakraborty, B., Debnath, L. (1985) International Journal of Mathematics and Mathematical Sciences
Subgroups of the group of generalized Lorentz transformations and their geometric invariants. Bogoslovsky, George Yu. (2005) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]