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34-XX - Ordinary differential equations [MSC 2020] |
34A30 - Linear ordinary differential equations and systems, general [MSC 2020] |
34A34 - Nonlinear ordinary differential equations and systems, general theory [MSC 2020] |
91D20 - Mathematical geography and demography [MSC 2020] |
92-XX - Biology and other natural sciences [MSC 2020] |
92D25 - Population dynamics (general) [MSC 2020] |
92D30 - Epidemiology [MSC 2020] |