The Cauchy problem for the Gross–Pitaevskii equation P. Gérard (2006) Annales de l'I.H.P. Analyse non linéaire
The equivalence between the Hamiltonian and Lagrangian formulations for the parametrization-invariant theories. Muslih, S.I. (2002) International Journal of Mathematics and Mathematical Sciences
The Kowalevski's top and the method of Syzygies Franco Magri (2005) Annales de l’institut Fourier A new algorithm for finding separation coordinates is tested on the example of Kowalev ski’s top.