H. M. Goodwin and H. T. Kalmus
Phys. Rev. (Series I) 28, 1 (1909) - Published 1 January, 1909
Percy Hodge
Phys. Rev. (Series I) 28, 25 (1909) - Published 1 January, 1909
Frank Allen
Phys. Rev. (Series I) 28, 45 (1909) - Published 1 January, 1909
F. A. Molby
Phys. Rev. (Series I) 28, 57 (1909) - Published 1 January, 1909
