Found in articles
https://books.google.co.jp/books?id=P2UAAAAAcAAJ Volume 2, 1866 Poestion, Josef Calasanz (1884). Isländische Märchen. Wien: C. Gerold. https://books
jódsaga, https://books.google.co.jp/books?ei=dCUwUuPFA4nM9QTim4HoBg Poestion, Josef Calasanz (1884), “XVIII. Das Pferd Gullfaxi und das Schwert Gunnfjödur”
102–108, https://books.google.com/books?id=7W_gAAAAMAAJ&pg=PA102 Poestion, Josef Calasanz, ed. (1884), “XXXV. Die Riesin in dem Steinboote” (ドイツ語),