2824 20160701171711.0 10.1017/S1743921311010118 DOI ASTROimport-981 Zorec, J. 2011 Spectroscopic and interferometric approach for differential rotation in massive fast rotators The coupling between the convective region in the envelope and rotation can produce a surface latitudinal differential rotation that may induce changes of the stellar geometry and on the spectral line profiles that it may be scrutinized spectroscopically and by interferometry. Frémat, Y. Delaa, O. Domiciano de Souza, A. Stee, P. Mourard, D. Cidale, L. S. Martayan, C. Active OB Stars: Structure, Evolution, Mass Loss, and Critical Limits 272 2011 103-105 http://esoads.eso.org/abs/2011IAUS..272..103Z published in NONREF