Balloon measurements of solar protons in northern Scandinavia on 7 July 1966. Heristchi, Dj. ; Kangas, J. ; Kremser, G. ; Legrand, J. -P. ; Masse, P. ; Palous, M. ; Pfotzer, G. ; Riedler, W. ; Wilhelm, K. Abstract Publication: Annals of the IQSY Pub Date: 1969 Bibcode: 1969AIQSY...3..267H