AVITAL, E. J.; BHOLAH, N. D.; GIOVANELLI, G. C.; MILOH, T. Sound Scattering by an Elastic Spherical Shell and Its Cancellation Using a Multi-Pole Approach. Arch. Acoust. 2017, 42 (4), 697–705. https://doi.org/10.1515/aoa-2017-0072.