A seismic approach to testing different formation channels of subdwarf B stars Haili Hu, M.-A. Dupret, C. Aerts, G. Nelemans, S. D. Kawaler, A. Miglio, J. Montalban and R. Scuflaire A&A, 490 1 (2008) 243-252 Published online: 25 August 2008 DOI: 10.1051/0004-6361:200810233