Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleUeber P. A. Hansen's 'Dioptrische Untersuchungen'︁.AuthorsKrüss, HugoPublicationAstronomische Nachrichten, 1875, Vol 86, Issue 9, p138ISSN0004-6337Publication typeArticleDOI10.1002/asna.18750860904