Energy spectra of 50-keV to 20-MeV protons accelerated at corotating interaction regions at Ulysses - Desai, MI; Marsden, RG; Sanderson, TR; Lario, D; Roelof, EC; Simnett, GM; Gosling, JT; Balogh, A; Forsyth, RJ (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1999)