- Series: Letter columns for 'Science Fiction Times' (German) Series Record # 58954
- Letter columns for 'Science Fiction Times' (German)
- Diskussion (Science Fiction Times #127) (1972) [ES] by Hans Joachim Alpers [only as by uncredited]
- Diskussion (Science Fiction Times #128) (1972) [ES] by Ronald M. Hahn [only as by uncredited]
- Diskussion (Science Fiction Times #130) (1973) [ES] by Hans Joachim Alpers [only as by uncredited]
- Leserpost (Science Fiction Times, Februar 1984) (1984) [ES] by Marcel Bieger and Harald Pusch [only as by uncredited]