F. C. Brown and Joel Stebbins
Phys. Rev. (Series I) 26, 273 (1908) - Published 1 April, 1908
C. Barus
Phys. Rev. (Series I) 26, 299 (1908) - Published 1 April, 1908
G. W. Stewart
Phys. Rev. (Series I) 26, 302 (1908) - Published 1 April, 1908
Fernando Sanford
Phys. Rev. (Series I) 26, 306 (1908) - Published 1 April, 1908
C. A. Pierce
Phys. Rev. (Series I) 26, 312 (1908) - Published 1 April, 1908
Phys. Rev. (Series I) 26, 331 (1908) - Published 1 April, 1908
