John Daniel
Phys. Rev. (Series I) 1, 241 (1894) - Published 1 January, 1894
A. E. Kennelly and Reginald A. Fessenden
Phys. Rev. (Series I) 1, 260 (1894) - Published 1 January, 1894
E. H. Loomis
Phys. Rev. (Series I) 1, 274 (1894) - Published 1 January, 1894