H. Helm

Experimental measurements on the current balance at the cathode of a cylindrical hollow cathode glow discharge

H. Helm, 1979 .

Preliminary investigation of the structure of the upper ionosphere as observed by the topside sounder satellite, Alouette

Sir Harrie Massey, D. Eccles, J. W. King, 1964, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

Measurements of magnetic declination during the solar eclipse of 23 October 1957

J. W. King, H. Helm, A. V. Wijk, 1959 .

Operating Experience The Stanford Two-Mile Linear Accelerator has been

Koontz, A. G., R., 1969 .