Migration came to Early Medieval England, study finds
medievalists.net
medievalists.net
There’s an accompanying paper as well. It’s mostly about India but he does go into the branch of indo europeans that went off into Europe as well.
Something along the lines of 90% of the male population was killed off in Eastern Europe, Germany, and most Northern European places. It was something like 75% of the male population killed off in Italy, Spain etc.