André Deprit

• A manifold of periodic orbits
• Asymptotic representation of the cycle of Van der Pol's equation for small damping coefficients
• Birkhoff's normalization
• Canonical transformations depending on a small parameter
• Compression of ephemerides by discrete Chebyshev approximations
• Computerized expansions in elliptic motion
• Construction of orbits asymptotic to a periodic orbit
• Natural families of periodic orbits
• Natural orbits of the first kind in the restricted problem
• Periodic Trojan orbits for the resonace 1/12
• Stability of the triangular Lagrangian points
• The trojan manifold in the system Earth-Moon