@article{1381549,
      author = {Hawkes, P. W. and Kasper, E.},
      url = {http://library.usi.edu/record/1381549},
      title = {Principles of electron optics., Volume 1,: Basic geometry  optics /},
      publisher = {Academic Press,},
      recid = {1381549},
      pages = {1 online resource (xii, 623, xviii pages ) :},
      address = {London ;},
      year = {1996},
}