BibTex format
@article{Nicol:2010,
author = {Nicol, ED and Schultz, C and Stirrup, J and Roughton, M},
journal = {International journal of …},
title = {Defining the appropriate CTA stenosis threshold for gatekeeping to invasive angiography: 50% or 70%?},
url = {http://www.sciencedirect.com/science/article/pii/S0167527309002307},
year = {2010}
}