- Dyulgerov, Georgi5
- Kirkov, Lyudmil3
- Geréb, Anna2
- Hristov, Hristo2
- Zakhariev, Eduard2
- Andonov, Metodi1
- Bulgarian Unit1
- Information Services Department1
- International Helsinki Federation for Human Rights1
- Open Media Research Institute1
- Radev, Simeon1
- Radev, Valo1
- Radio Free Europe/Radio Liberty, Inc - Research Institute1
- Sharaliev, Borislav1
- Stoyanov, Georgi1
- Valchanov, Rangel1
- Volev, Nikolai1
- Wolf, Konrad1