Three-dimensional modeling of type Ia supernovae – The power of late time spectra C. Kozma, C. Fransson, W. Hillebrandt, C. Travaglio, J. Sollerman, M. Reinecke, F. K. Röpke and J. Spyromilio A&A, 437 3 (2005) 983-995 Published online: 30 June 2005 DOI: 10.1051/0004-6361:20053044