D.G. Cheremukhin Dynamics of Artists Productivity. Volume 1,2,3 (3 books). In Russian (ask us if in doubt)/Cheremukhin D.G. Dinamika produktivnosti khudozhnikov. Tom 1,2,3 (3 knigi). Under the editorship of Shikun A.F. M 2002. 283c,. SKUalb0c5cc95571df33cd.