Why did Comet 17P/Holmes burst out? - Nucleus splitting or delayed sublimation?W. J. Altenhoff, E. Kreysa, K. M. Menten, A. Sievers, C. Thum and A. WeissA&A, 495 3 (2009) 975-978DOI: https://doi.org/10.1051/0004-6361:200810458