Practical aspects of Boersch phase contrast electron microscopy of biological specimens.
von Andreas, Walter
Walter, A., Muzik, H., Vieker, H., Turchanin, A., Beyer, A., Gölzhäuser, A., Lacher, M., Steltenkamp, S., Schmitz, S., Holik, P., Kühlbrandt, W., Rhinow, D., Ultramicroscopy, 116:62-72 (2012)