Hartmann, T., Kramer, A., Hillebrand, A., & Guckenberger, R. (1998). Test sample structured by metal shadowing using salt crystals as mask. In R. C. J.P., A. Engel, J. Frommer, H. Gaub, A. Gerwirth, R. Guckenberger, et al. (Eds.), Procedures in Scanning Probe Microscopies (pp. 12-16). Chichester-New York: John Wiley & Sons.