Boris Yakovlovic Bukreev
 (September 6, 1859 - October 2, 1962) 
 Boris Yakovlovic Bukreev was a Russian mathematician who worked in the areas of complex functions and differential equations.
 In 1889, Bukreev became a professor of mathematics at the University of Kiev, in the Ukraine. He studied Fuchsian functions of rank zero. He was interested in projective and non-Euclidean geometry. He worked on differential invariants and parameters in the theory of surfaces. The history of mathematics interested him.
 Books
A Course on Applications of Differential and Integral Calculus to Geometry
An Introduction to the Calculus of Variations
Non-Euclidean Planimetry in Analytic Terms 
 Taken from:
 http://www.freeglossary.com/Boris_Yakovlovic_Bukreev  Also see:
 http://www.worldhistory.com/wiki/B/Boris-Yakovlovic-Bukreev.htm
 http://boris-yakovlovic-bukreev.wikiverse.org/ http://www.ipedia.com/boris_yakovlovic_bukreev.html
 http://en.wikipedia.org/wiki/Boris_Yakovlovic_Bukreev