Hungarians keep it close to the vest, when it comes to literature on their swords. Polish swords are close to the Hungarian ones. For some unknown to me reason, Eastern Europeans refuse to publish books on edged weapons in English.
Here's a good recent volume on Polish swords...not in English.
https://www.ebay.com/itm/25486890187...IAAOSwM2deP~FI
What is a Transylvanian knot?