Jockers, K. Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society; MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Jockers, K. (1997). A two-channel focal reducer for small (diameter gt;= 1 m) F/8 telescopes. expa, 7, 305-318.