W. O. Atwater and E. B. Rosa
Phys. Rev. (Series I) 9, 129 (1899) - Published 1 September, 1899
Fred E. Kester
Phys. Rev. (Series I) 9, 164 (1899) - Published 1 September, 1899
Leon W. Hartman
Phys. Rev. (Series I) 9, 176 (1899) - Published 1 September, 1899
Rolla R. Ramsey
Phys. Rev. (Series I) 9, 189 (1899) - Published 1 September, 1899
