BibTex format
@article{Thompson:1997:10.1007/s004600050367,
author = {Thompson, RC and Wilson, DC},
doi = {10.1007/s004600050367},
journal = {ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS},
pages = {271--277},
title = {The motion of small numbers of ions in a Penning trap},
url = {http://dx.doi.org/10.1007/s004600050367},
volume = {42},
year = {1997}
}