The seismic Sun over three activity cycles Chaplin, W. J. ; Elsworth, Y. ; Hale, S. J. ; Miller, B. A. ; Verner, G. A. ; New, R. Abstract Publication: Proceedings of SOHO 18/GONG 2006/HELAS I, Beyond the spherical Sun Pub Date: October 2006 Bibcode: 2006ESASP.624E...8C