@misc{appel_surface_effects_1995, 
author={Appel, F., Wagner, R.},
title={Surface effects on crystal defects},
year={1995},
howpublished = {conference lecture: Halle (D);},
note = {Appel, F.; Wagner, R.: Surface effects on crystal defects. Autumn School „In situ EM in Materials Research – Present State and Future Prospects“. Halle (D), 1995.}}