@article{Ballantyne_2000,
title={The Primordial Helium Abundance: Toward Understanding and Removing the Cosmic Scatter in thedY/dZRelation},
volume={536},
ISSN={1538-4357},
url={http://dx.doi.org/10.1086/308984},
DOI={10.1086/308984},
number={2},
journal={The Astrophysical Journal},
publisher={American Astronomical Society},
author={Ballantyne,
D. R. and Ferland,
G. J. and Martin,
P. G.},
year={2000},
month=jun,
pages={773–777} }