@article{Oprea:828,
      author        = "Oprea, C. and Mierla, M. and Besliu-Ionescu, D. and Stere,
                       O. and Maris Muntean, G.",
      title         = "{A study of solar and interplanetary parameters of CMEs
                       causing major geomagnetic storms during SC 23}",
      year          = "2013",
}