@article{doi:10.1001/jama.2009.1368,
author = {Schroeder S},
title = {A composition of fractions},
journal = {JAMA},
volume = {302},
number = {14},
pages = {1509},
year = {2009},
doi = {10.1001/jama.2009.1368},
URL = { + http://dx.doi.org/10.1001/jama.2009.1368},
eprint = {/data/Journals/JAMA/4483/jpm90016_1509_1509.pdf}
}