Energetic proton observations at 1 and 5 AU 1. January-September 1997 - Lario,D; Marsden,RG; Sanderson,TR; Maksimovic,M; Sanahuja,B; Balogh,A; Forsyth,RJ; Lin,RP; Gosling,JT (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2000)