Hornik, Helmut; Lüdecke, Cornelia (2–3 June 2005). Wilhelm Filchner and Antarctica. 1st SCAR Workshop on the History of Antarctic Research, Bavarian Academy of Sciences and Humanities. p. 57. Archived from the original on 1 November 2020. Retrieved 28 September 2019.
web.archive.org
Hornik, Helmut; Lüdecke, Cornelia (2–3 June 2005). Wilhelm Filchner and Antarctica. 1st SCAR Workshop on the History of Antarctic Research, Bavarian Academy of Sciences and Humanities. p. 57. Archived from the original on 1 November 2020. Retrieved 28 September 2019.