Understanding the dynamical structure of pulsating stars: The Baade-Wesselink projection factor of the δ Scuti stars AI Velorum and β CassiopeiaeG. Guiglion, N. Nardetto, P. Mathias, A. Domiciano de Souza, E. Poretti, M. Rainer, A. Fokin, D. Mourard and W. GierenA&A, 550 (2013) L10DOI: https://doi.org/10.1051/0004-6361/201220780