В. В. Козлов, “Неаналитические первые интегралы аналитических систем дифференциальных уравнений в окрестности устойчивых положений равновесия”, Дифференц. уравнения, 59:6 (2023), 843–846 ; V. V. Kozlov, “Nonanalytic first integrals of analytic systems of differential equations in a neighborhood of stable equilibria”, Differ. Equ., 59 (2023), 862–865
Valery V. Kozlov, “Integrals of Circulatory Systems Which are Quadratic in Momenta”, Regul. Chaotic Dyn., 26:6 (2021), 647–657
В. В. Козлов, “Первые интегралы и асимптотические траектории”, Матем. сб., 211:1 (2020), 32–59 ; V. V. Kozlov, “First integrals and asymptotic trajectories”, Sb. Math., 211:1 (2020), 29–54
V. V. Kozlov, D. V. Treschev, “Instability, asymptotic trajectories and dimension of the phase space”, Mosc. Math. J., 18:4 (2018), 681–692
Valery V. Kozlov, Stanislav D. Furta, Springer Monographs in Mathematics, Asymptotic Solutions of Strongly Nonlinear Systems of Differential Equations, 2013, 1
Kozlov, VV, “Several problems on dynamical systems and mechanics”, Nonlinearity, 21:9 (2008), T149