LOW-ENERGY PROTON EXPERIMENT ON ISEE-C - BALOGH,A; VANDIJEN,G; VANGENECHTEN,J; HENRION,J; HYNDS,R; KORFMANN,G; IVERSEN,T; VANROOIJEN,J; SANDERSON,T; STEVENS,G; WENZEL,KP (IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1978)