Sunspot areas, flares and filaments observed at the Stockholm Observatory in the years 1950 and 1951 - Öhman, Yngve, 1903-1988; Lodén, Lars Olof, 1930-2016 ([Stockholm : Almqvist & Wiksells boktryckeri AB, 1952)
Keywords: astronomická pozorování; astronomie; sluneční aktivita; sluneční skvrny; astronomical observations; astronomy; solar activity; sun spots; monografie; separáty; monographs; offprints