1978 February  QST                                     p. 17
               A Long-Delayed Echo Revisited

               QST                                     p. 19
               More Reflections on LDEs

1980 March     QST                                     p. 14
               Observations of Long-Delayed Echoes on
               28 MHz

     October   QST                                     p. 11
               The Magnetosphere Echo Box - A Type of
               Long-Delayed Echo Explained