The absence of sub-minute periodicity in classical T Tauri stars H. M. Günther, N. Lewandowska, M. P. G. Hundertmark, H. Steinle, J. H. M. M. Schmitt, D. Buckley, S. Crawford, D. O'Donoghue and P. Vaisanen A&A, 518 (2010) A54 Published online: 02 September 2010 DOI: 10.1051/0004-6361/201013996