1. On the classical expansion of the perturbing function in individual orbital elements

   • Irina Tupikova
   • Michael Soffel
   • Sergei Klioner

   OriginalPaper Pages: 147 - 152

2. Improved nutation series for the non–rigid earth with a precise adjustment of parameters with nonlinear dependence

   • Juan Getino
   • Pablo MartÍn
   • JosÉ M. Farto

   OriginalPaper Pages: 153 - 162

3. A new solution to the lagrange's case of the three‐body problem

   • E. Piña

   OriginalPaper Pages: 163 - 174

4. Poincaré's méthode nouvelle by skew composition

   • Etienne Deprit
   • André Deprit

   OriginalPaper Pages: 175 - 197

5. Potentials having two orthogonal families of curves as trajectories

   • François Puel

   OriginalPaper Pages: 199 - 210

6. Solvable cases of Szebehely's equation

   • S. Grigoriadou
   • G. Bozis
   • B. Elmabsout

   OriginalPaper Pages: 211 - 221