@article{Obermair:95473,
      author        = "Obermair, M. and Hettler, S. and Hsieh, C. and Dries, M.
                       and Marko, M. and Gerthsen, D.",
      title         = "{Analyzing contrast in cryo-transmission electron
                       microscopy: Comparison of electrostatic Zach phase plates
                       and hole-free phase plates}",
      year          = "2020",
}