Erratum: Microwave Characteristics of a behind-the-Limb Proton Flare Krüger, A. ; Hildebrandt, J. ; Kliem, B. ; Aurass, H. ; Kurths, J. Abstract Publication: Solar Physics Pub Date: September 1991 DOI: 10.1007/BF00147513 Bibcode: 1991SoPh..135..423K