@article{doi:10.1001/jama.2009.1301,
author = {McVeigh ME and Mann SJ},
title = {The journal impact factor denominator: Defining citable (counted) items},
journal = {JAMA},
volume = {302},
number = {10},
pages = {1107-1109},
year = {2009},
doi = {10.1001/jama.2009.1301},
URL = { + http://dx.doi.org/10.1001/jama.2009.1301},
eprint = {/data/Journals/JAMA/4479/jco90094_1107_1109.pdf}
}