References for Nikolai M Krylov

Biography in Dictionary of Scientific Biography (New York 19701990).
Books:

N N Bogolyubov, Nikolai Mitrofanovich Krylov (on his Seventieth Birthday),
Uspekhi matematicheskikh nauk 5 (1950).
Articles:

A N Bogolyubov, N M Krylov as a historian of mathematics (Russian), Outlines
on the history of mathematics and physics in the Ukraine (Kiev, 1978),
314.

N N Bogolyubov, Nikolai Mitrofanovic Krylov (For his seventieth birthday)
(Russian), Ukrain. Mat. Zurnal 2 (3) (1950), 36.

T F Lucka, An investigation of the rate of convergence of the variational
methods in the works of N M Krylov and N N Bogoljubov (Russian), Problems
in the history of mathematics and mechanics (Kiev, 1977), 8197.

T F Lucka, The contribution of N M Krylov and N N Bogoljubov to the development
of variational methods in mathematical physics (Russian), Outlines on
the history of mathematics and physics in the Ukraine (Kiev, 1978),
1530.

Ya A Matviishin, Problems in the theory of nonlinear differential equations
in the early works of N M Krylov (Russian), Akad. Nauk Ukrain. SSR Inst.
Mat. 56 (1985), 312.

Obituary: Nikolai Mitrofanovic Krylov (Russian), Ukrain. Mat. Z.
7 (1955), 347359.