I came across a book on the internet that connected the Avars to the Khazars. It was written sometime during the 1920's-40's, I think the mid 20's, by a European scholar. It never became popular. This was a while ago, and now I can't find anything like it. It's left me with that weird feeling where I question if I'm making it up. I don't remember the language. What I remember is that I saw it on a website, along with a picture of him or his book, which was yellow and orange.
He said that the Avars who invaded Europe were essentially the same people as the Khazars. I'm interested in the possibility that there was a shared interest in the Turkic elements in the Avar and the Khazar Khaganates.
What is the book that I'm thinking of? The only way that I can think of to find it, is to sift through all of the Eastern European Turkic or Slavic scholars. Maybe the book title included Khazars, Avars, or Khazaria.