1. Raymer, D.: Aircraft design: a conceptual approach, 2nd edn. AIAA, Washington (1992)
2. Lier, M., Harbig, K., Kohlgrüber, D., Krenik, A., Kunze, P., Lützenburger, M.: Studies on rotorcraft integrated design and evaluation at DLR—first results. In: Proceedings of the $$38{\rm th}$$ European Rotorcraft Forum. Amsterdam, Netherlands (2012)
3. Lier, M., Kohlgrüber, D., Krenik, A., Kunze, P., Lützenburger, M., Schwinn, D.B.: Rotorcraft pre-design activities at DLR—results, status and outlook. In: Proceedings of the $$40{\rm th}$$ European Rotorcraft Forum. Southampton, UK (2014)
4. Lier, M., Krenik, A., Kunze, P., Kohlgrüber, D., Lützenburger, M., Schwinn, D.B.: A toolbox for rotorcraft preliminary design. In: Proceedings of the $$71{\rm st}$$ Annual Forum of the American Helicopter Society. Virginia Beach, VA, USA (2015)
5. Nagel, B., Böhnke, D., Gollnick, V., Schmollgruber, P., Rizzi, A., La Rocca, G., Alonso, J.J.: Communication in aircraft design: Can we establish a common language? In: Proceedings of the $$28{\rm th}$$ International Congress of the Aeronautical Sciences (ICAS). Brisbane, Australia (2012)