Ambiguities in Pauli-Villars regularization por R.H.P. Kleiss e T. Janssen Radboud publicado pelo "Institute for Mathematics, Astrophysics and Particle Physics of University Nijmegen" DOI: 10.1140/epjc/s10052-014-3240-5 " arXiv:1405.1536 " (2014)
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Regularization por Hitoshi Murayama, publicado por "Lawrence Berkeley National Laboratory" (2007)