Fröhlich, H.; Heitler, W.; Kemmer, N. (1938). "On the Nuclear Forces and the Magnetic Moments of the Neutron and the Proton". Proceedings of the Royal Society of London A: Mathematical and Physical Sciences. 166 (924): 154–177. Bibcode:1938RSPSA.166..154F. doi:10.1098/rspa.1938.0085.
Fröhlich, H.; Heitler, W.; Kemmer, N. (1938). "On the Nuclear Forces and the Magnetic Moments of the Neutron and the Proton". Proceedings of the Royal Society of London A: Mathematical and Physical Sciences. 166 (924): 154–177. Bibcode:1938RSPSA.166..154F. doi:10.1098/rspa.1938.0085.