1. Boundary value problems for the equation ϵ y = f(x, y, ẏ) for small ϵ;Brish;Dokl. Akad. Nauk SSSR,1954
2. Asymptotic formulae for the solution of boundary value problems for a second-order equation with a small parameter coefficient of the highest-order derivative;Vasil'eva;Dokl. Akad. Nauk. SSSR,1960
3. Periodic solutions of systems of differential equations with a small parameter coefficient of almost discontinuous derivatives;Vasil'eva;Dokl. Akad. Nauk SSSR,1968
4. Sleeted Papers on Mechanics and Mathematics;Chaplygin,1954
5. Uber das Verhalten des Integrals von λÿ + f(x, y, y, λ) = 0 für λ → 0;Nagumo,1939