Nakano, Tadao; Nishijima, Kazuhiko (novembar 1953). „Charge Independence for V-particles”. Progress of Theoretical Physics. 10 (5): 581. doi:10.1143/PTP.10.581. „The 'baryon' is the collective name for the members of the nucleon family. This name is due to Pais. See ref. (6).”