1. Wolff, G. A., Hebert, R. A., and Brodev, J. P., Phys. Rev., 100, 1144 (1955).
2. Loebner, E. E., and Poor, jun., E. W., Phys. Rev. Letters, 3, 23 (1959).
3. Holf, D. A., Alfray, G. F., and Wiggins, C. S., Nature, 181, 109 (1958).
4. Mandelkorn, J., Proc. Inst. Rad. Eng., 47, No. 11, 2012 (November 1959).
5. Mandelkorn, J., “Gallium Phosphide High Temperature High Frequency Point-Contact Diodes”, Electronics Components Conference, Washington, D.C., May 10, 1960.