@article{ref1,
title="Vitamin A and calcium in mine compound diets",
journal="South African medical journal SAMJ",
year="1973",
author="Coetzee, A. M. and Politzer, W. M. and Georges, R. J.",
volume="47",
number="17",
pages="739-742",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0038-2469",
doi="",
url="http://dx.doi.org/"
}