Obviously there's a swedish book about the FW 190 Nitsch flew to Sweden - and now restored has returned to Sweden. If I have understood it right, two of the pilots who flew this specific plane during the war, Franz Eisenach and "our" Ludwig Nitsch, are portrayed in the book.
It's called "En svensk Focke-Wulf 190 : En dramatisk svensk-tysk flyghistoria" (A swedish Focke-Wulf 190: A dramatic swedish-german flight history) and is written by Christer Bergström.
I haven't read the book but would be most interested to hear if somebody has - and especially if Nitschs "38 kills" are mentioned in the book...!?
https://vaktelforlag.se/produkt/en-s...-flyghistoria/