F. C. Blake and C. R. Fountain

Phys. Rev. (Series I) 23, 257 (1906) - Published 1 October, 1906

C. C. Trowbridge

Phys. Rev. (Series I) 23, 279 (1906) - Published 1 October, 1906

John Zeleny and Anthony Zeleny

Phys. Rev. (Series I) 23, 308 (1906) - Published 1 October, 1906

Charles B. Thwing

Phys. Rev. (Series I) 23, 315 (1906) - Published 1 October, 1906