An English translation of Csaba B Stenge's book on the Hungarian aces is forthcoming from Helion.
http://www.helion.co.uk/new-and-fort....html?___SID=U
Listed for April 15, 2018 on the Helion website (above), it is also listed on the Amazon.com website for August 2, 2018,
https://www.amazon.com/gp/product/19...=ATVPDKIKX0DER
April 15, 2018 on Amazon.co.uk, and April 28, 2018 on the BookDepository webpage.
The August date for Amazon.com may reflect a more realistic view of Helion's scheduling, or possibly the use of mermules to pull the wagon train of books across the Atlantic.
Enjoy!
Frank.