@misc{indiciaec4846ac5e32d, title = {Helicopter Model Rotor-Blade Vortex Interaction Impulsive Noise: Scalability and Parametric Variations}, author = {Boxwell, D. A. and Schmitz, F. H. and Splettstoesser, W. R. and Schultz, K. J.}, year = {1987}, url = {https://ntrs.nasa.gov/citations/19990111581}, note = {Source identifier: 19990111581} }