* Proto-Altaic
* Proto-Koreo-Japonic
* Sprachbund
* Buyeo-Goguryeo languages
* Tungusic branch (I need a lot on this!!)
My university's research database doesn't have too much to offer, so I'm looking for other academic journals/books/etc. I'm of course looking for things beyond the citations on the Wiki pages. If the materials are online, I would love both Korean and Japanese sources. Any help at all is very much appreciated!