1. Towards a sustainable exploitation of the geosynchronous orbital region

   • Ioannis Gkolias
   • Camilla Colombo

   Original Article Open access 27 April 2019 Article: 19

   

2. A monotonic starter for solving the hyperbolic Kepler equation by Newton’s method

   • M. Calvo
   • A. Elipe
   • L. Rández

   Original Article 27 April 2019 Article: 18

3. The inverse problem for homothetic polygonal central configurations

   • Marcelo P. Santos

   Original Article 17 April 2019 Article: 17