Irving Langmuir and Karl T. Compton
Rev. Mod. Phys. 3, 191 (1931) - Published 1 April, 1931
Harvey Fletcher
Rev. Mod. Phys. 3, 258 (1931) - Published 1 April, 1931
David M. Dennison
Rev. Mod. Phys. 3, 280 (1931) - Published 1 April, 1931