1.
Buică A, Giné J, Llibre J. Periodic solutions for nonlinear differential systems: the second order bifurcation function. TMNA [Internet]. 2016 Apr. 12 [cited 2024 Apr. 18];43(2):403-19. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2014.024