Spatial stability of the frequency response estimate and the benefit of spatial averaging
https://assets.ctfassets.net/4zjnzn055a4v/6nKDWR1VsWp2WkaAqdvdDT/09402de507362053495f5f53e8a86d87/AES_141_-_Spatial_Stability_of_the_Frequency_Response_Estimate_and_the_Benefit_of_Spatial_Averaging.pdf