Genetics of modern Russians from St. Petersburg, Samara, and Orenburg: https://www.nature.com/articles/s41467-024-50304-1
Genetics of modern Russians from Novosibirsk and Siberia: https://pmc.ncbi.nlm.nih.gov/articles/PMC5751809/
Genetic history of Slavic migrations into Russia: https://www.sciencedirect.com/science/article/pii/S0960982222018267