On the Sensitivity of a Hollow Sphere as a Multi-modal Resonant   Gravitational Wave Detector
  We present a numerical analysis to simulate the response of a spherical resonant gravitational wave detector and to compute its sensitivity. Under the assump- tion of optimal filtering, we work out the sensitivity curve for a sphere first taking into account only a single transducer, and then using a coherent analysis of the whole set of transducers. 
Florian Dubath, Jerome Extermann, Luciano Gottardi