C. S. Hudson
Phys. Rev. (Series I) 22, 257 (1906) - Published 1 May, 1906
Edw L. Nichols and Ernest Merritt
Phys. Rev. (Series I) 22, 279 (1906) - Published 1 May, 1906
Francis Gano Benedict
Phys. Rev. (Series I) 22, 294 (1906) - Published 1 May, 1906
K. Honda and T. Terada
Phys. Rev. (Series I) 22, 300 (1906) - Published 1 May, 1906
L. W. Austin
Phys. Rev. (Series I) 22, 312 (1906) - Published 1 May, 1906
B. B. Boltwood
Phys. Rev. (Series I) 22, 320 (1906) - Published 1 May, 1906