Modelling the initiation of coronal mass ejections: magnetic flux emergence versus shearing motionsF. P. Zuccarello, C. Jacobs, A. Soenen, S. Poedts, B. van der Holst and F. ZuccarelloA&A, 507 1 (2009) 441-452DOI: https://doi.org/10.1051/0004-6361/200912541