W. D. Harkins.

Phys. Rev. 15, 73 (1920) - Published 1 February, 1920

Edwin C. Kemble.

Phys. Rev. 15, 95 (1920) - Published 1 February, 1920

Mabel Katherine Frehafer

Phys. Rev. 15, 110 (1920) - Published 1 February, 1920

Phys. Rev. 15, 126 (1920) - Published 1 February, 1920