scientific article; zbMATH DE number 3329210
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Publication:5607385
zbMath0207.08801MaRDI QIDQ5607385
Publication date: 1970
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Periodic solutions to ordinary differential equations (34C25) Stability theory for ordinary differential equations (34D99) Variational principles of physics (49S05)
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