Arthur L. Day and E. T. Allen
Phys. Rev. (Series I) 19, 177 (1904) - Published 1 September, 1904
W. P. Boynton
Phys. Rev. (Series I) 19, 187 (1904) - Published 1 September, 1904
George W. Pierce
Phys. Rev. (Series I) 19, 196 (1904) - Published 1 September, 1904
D. B. Brace
Phys. Rev. (Series I) 19, 218 (1904) - Published 1 September, 1904
P. G. Nutting
Phys. Rev. (Series I) 19, 231 (1904) - Published 1 September, 1904
