G. Breit
Phys. Rev. 17, 649 (1921) - Published 1 June, 1921
Laura Brant
Phys. Rev. 17, 678 (1921) - Published 1 June, 1921
Ben E. Brown
Phys. Rev. 17, 700 (1921) - Published 1 June, 1921
E. L. Nichols and D. T. Wilber
Phys. Rev. 17, 707 (1921) - Published 1 June, 1921
