@article{Dickinson_1979, title={Helicopter Noise Propagation Studies for Air Installation Compatible Land Use Zoning}, volume={7}, url={https://jcaa.caa-aca.ca/index.php/jcaa/article/view/423}, number={1}, journal={Canadian Acoustics}, author={Dickinson, Philip}, year={1979}, month={Jan.}, pages={14–31} }