TY  - RPRT
TI  - van der Waals interactions between sharp probes and flat sample surfaces.
AU  - U Hartmann
PY  - 1991
DO  - 10.1103/physrevb.43.2404
UR  - https://pubmed.ncbi.nlm.nih.gov/9997520/
ID  - 9997520
ER  -