@article{ref1,
title="Extracts of two letters, the one of Mr. Newton, concerning the number of colors, and the necessity of mixing them all for the production of white, &c; the other, of a philosopher at Paris, by way of answer to the former",
journal="Philosophical transactions of the Royal Society of London (1665)",
year="1673",
author="Newton, Isaac",
volume="8",
number="97",
pages="6108-6112",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0370-2316",
doi="",
url="http://dx.doi.org/"
}