Fabry, Christian, i Patrick Habets. „Degree Computations for Positively Homogeneous Differential Equations”. Topological Methods in Nonlinear Analysis 23, no. 1 (marzec 1, 2004): 73–88. Udostępniono lipiec 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2004.004.