Kaufmann, Phys. Zeit. 4, No. 1 b, p. 54, 1902.

Abraham, Phys. Zeit. 4, No. 1 b, p. 57, 1902.

Kaufmann, Nachrichten d. Ges. d. Wiss. zu Gött., Nov. 8, 1901.

Simon, Annal. d. Phys. p. 589, 1899.

Kaufmann, Phys. Zeit. 4, No. 1 b, p. 54, 1902.

Paschen, Annal. d. Phys. 14, p. 389, 1904.

Meyer and Schweidler, Phys. Zeit. pp. 90, 113, 209, 1900.

Lenard, Annal. d. Phys. 56, p. 275, 1895.

Strutt, Nature, p. 539, 1900.

Seitz, Phys. Zeit. 5, No. 14, p. 395, 1904.