Raymond Haskell
Phys. Rev. (Series I) 27, 145 (1908) - Published 1 September, 1908
O. W. Richardson
Phys. Rev. (Series I) 27, 183 (1908) - Published 1 September, 1908
C. F. Hagenow
Phys. Rev. (Series I) 27, 196 (1908) - Published 1 September, 1908
Chan. W. Waggoner
Phys. Rev. (Series I) 27, 209 (1908) - Published 1 September, 1908
