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Bressi, G.; Carugno, G.; Della Valle, F.; Galeazzi, G.; Sartori, G. (2011). "Testing the neutrality of matter by acoustic means in a spherical resonator". Physical Review A. 83 (5): 052101. arXiv:1102.2766. doi:10.1103/PhysRevA.83.052101. S2CID118579475.
Bressi, G.; Carugno, G.; Della Valle, F.; Galeazzi, G.; Sartori, G. (2011). "Testing the neutrality of matter by acoustic means in a spherical resonator". Physical Review A. 83 (5): 052101. arXiv:1102.2766. doi:10.1103/PhysRevA.83.052101. S2CID118579475.