http://coa.inducks.org/story.php?c=W+WDC+104-02
Carl Barks 1949 L'eredità di Paperino (The Sunken Yacht)
http://goodcomics.comicbookresources.com/2006/10/19/comic-book-urban-legends-revealed-73/
http://www.iusmentis.com/patents/priorart/donaldduck/
http://www.starch.dk/isi/kroyer/schrooge.asp **
Mythbuster: https://youtu.be/-FmnxBIe75s