Abraham, Mervin Thomas, Otto Kellerman, Marcus Pettersson, and Martin Wiberg. “High-Velocity Helicopter Concepts”. TMAL02 Expert Conference 24, no. 2 (September 3, 2020): 45–46. Accessed September 27, 2022. https://wcc.ep.liu.se/index.php/TMAL02/article/view/684.