B. J. Spence
Phys. Rev. (Series I) 28, 233 (1909) - Published 1 April, 1909
J. R. Roebuck
Phys. Rev. (Series I) 28, 264 (1909) - Published 1 April, 1909
Anthony Zeleny and O. Hovda
Phys. Rev. (Series I) 28, 277 (1909) - Published 1 April, 1909
R. E. Nyswander
Phys. Rev. (Series I) 28, 291 (1909) - Published 1 April, 1909
