Media type: E-Article Title: A Counterexample to the Theorem of Laplace–Lagrange on the Stability of Semimajor Axes Contributor: Clarke, Andrew; Fejoz, Jacques; Guardia, Marcel Published: Springer Science and Business Media LLC, 2024 Published in: Archive for Rational Mechanics and Analysis, 248 (2024) 2 Language: English DOI: 10.1007/s00205-024-01960-6 ISSN: 1432-0673; 0003-9527 Origination: Footnote: