Rittner, E.S., Rutledge, W.C. and R.H. Ahlert., “On the Mechanism of Operation of the Barium Aluminate Impregnated Cathode”, Journal of Applied Physics 28/4 (1957): 1468-1474.

Rittner, E.S., Rutledge, W.C. and R.H. Ahlert., “On the Mechanism of Operation of the Barium Aluminate Impregnated Cathode”, Journal of Applied Physics 28/4 (1957): 1468-1474.