Buy the book about Kha from BOD bookshop below.
The book, written by Finn in 2023, is 160 pages and hardback. It is beautifully illustrated with 50 colour illustrations explaining different aspects of the Kha theory. Please note: the first part of the book is in Danish, while the back 36% is in English. The English part contains all the mathematical calculations for the Kha theory.
The book about Kha is also available on Amazon and through many other online book stores.