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Poretti, E. The Frequency Content of δ Scuti Stars as Determined by Photometry. Breger, Michel; Montgomery, Michael (编). Delta Scuti and Related Stars, Reference Handbook and Proceedings of the 6th Vienna Workshop in Astrophysics, held in Vienna, Austria, 4–7 August 1999. ASP Conference Series 210. 2000: 45. Bibcode:2000ASPC..210...45P. arXiv:astro-ph/0002304.