WEIGHTLESS IN THE DROP TOWER BREMEN. ZARM - CENTER OF APPLIED SPACE TECHNOLOGY AND MICROGRAVITY [online]. Universität Bremen [cit. 2023-04-08]. Dostupné online. (anglicky)
How does the drop tower work?. ZARM - CENTER OF APPLIED SPACE TECHNOLOGY AND MICROGRAVITY [online]. Universität Bremen [cit. 2023-04-08]. Dostupné online. (anglicky)