@article{DT048,
   Author = {Tomanek, D. and Zhong, W. and Thomas, H.},
   Title = {Calculation of an atomically modulated friction force
            in atomic-force microscopy},
   Journal = {Europhys. Lett.},
   Volume = {15},
   Number = {8},
   Pages = {887--892},
   url = {http://dx.doi.org/10.1209/0295-5075/15/8/014},
   doi = {10.1209/0295-5075/15/8/014},
   Year = {1991} }