@article{Lagoda_Parasyuk_Samoilenko_2012, title={Lipschitzian invariant tori of indefinite monotone system}, volume={64}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/2582}, abstractNote={We consider a nonlinear system in the direct product of a torus and a Euclidean space. For this system, under the conditions of indefinite coercivity and indefinite monotonicity, we establish the existence of a Lipschitzian invariant section.}, number={3}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Lagoda, V. A. and Parasyuk, I. O. and Samoilenko, A. M.}, year={2012}, month={Mar.}, pages={363-383} }