Periodic solutions of singular second order differential equations: Upper and lower functions
- Hakl, R.
- Torres, P.J.
- Zamora, M.
ISSN: 0362-546X
Year of publication: 2011
Volume: 74
Issue: 18
Pages: 7078-7093
Type: Article
ISSN: 0362-546X
Year of publication: 2011
Volume: 74
Issue: 18
Pages: 7078-7093
Type: Article