@article{DT041,
   Author = {Zhong, W. and Overney, G. and Tomanek, D.},
   Title = {Limits of resolution in atomic force microscopy images
            of graphite},
   Journal = {Europhys. Lett.},
   Volume = {15},
   Number = {1},
   Pages = {49--54},
   Year = {1991} }