Pseudospin symmetry as an accidental symmetry in the relativistic framework S. Marcos, M. López-Quelle, R. Niembro and L. N. Savushkin Eur. Phys. J. A, 37 2 (2008) 251 Published online: 17 July 2008 DOI: 10.1140/epja/i2008-10619-1