@article{doi:10.1001/jama.1989.03420160016005,
author = {Silverman S},
title = {STates modify certificate to meet specific needs},
journal = {JAMA},
volume = {261},
number = {16},
pages = {2300-2305},
year = {1989},
doi = {10.1001/jama.1989.03420160016005},
URL = { + http://dx.doi.org/10.1001/jama.1989.03420160016005},
eprint = {/data/Journals/JAMA/9159/jama_261_16_005.pdf}
}