author        = "Dolla, L. and Marqué, C. and Seaton, D.B. and Van
                       Doorsseleare, T. and Dominique, M. and Berghmans, D. and
                       Cabanas Parada, C. and De Groof, A. and Schmutz, W. and
                       Verdini, A. and West, M. and Zender, J. and Zhukov, A.N.",
      title         = "{Time delays in quasi-periodic pulsations observed during
                       the X2.2 solar flare on 2011 February 15}",
      year          = "2012",