Pryce, M. H. L. (1948). «The mass-centre in the restricted theory of relativity and its connexion with the quantum theory of elementary particles». Proceedings of the Royal Society of London A. 195: 62–81. Bibcode:1948RSPSA.195...62P. doi:10.1098/rspa.1948.0103
Tani, S. (1951). «Connection between particle models and field theories. I. The case spin 1/2». Progress of Theoretical Physics. 6: 267–285. Bibcode:1951PThPh...6..267T. doi:10.1143/ptp/6.3.267
Pryce, M. H. L. (1948). «The mass-centre in the restricted theory of relativity and its connexion with the quantum theory of elementary particles». Proceedings of the Royal Society of London A. 195: 62–81. Bibcode:1948RSPSA.195...62P. doi:10.1098/rspa.1948.0103
Tani, S. (1951). «Connection between particle models and field theories. I. The case spin 1/2». Progress of Theoretical Physics. 6: 267–285. Bibcode:1951PThPh...6..267T. doi:10.1143/ptp/6.3.267