@article{ref1,
title="Central nervous system effects of ingestion of L-tryptophan by normal subjects",
journal="New England journal of medicine",
year="1962",
author="Smith, Brent and Prockop, D. J.",
volume="267",
number="",
pages="1338-1341",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0028-4793",
doi="",
url="http://dx.doi.org/"
}