Source: https://www.researchgate.net/profile/Joppe-Gosker-3/publication/371984128_The_Old_Sword_and_the_Sea_A_Medieval_European_Sword_Off_the_Coast_of_Newe-Yam/links/64a1134bc41fb852dd449619/The-Old-Sword-and-the-Sea-A-Medieval-European-Sword-Off-the-Coast-of-Newe-Yam.pdf