BibTex format
@unpublished{Martin:2009,
author = {Martin, R and Wagner, U},
title = {Survey of firms’ responses to public incentives for energy innovation, including the UK Climate Change Levy and Climate Change Agreements},
url = {http://www.olis.oecd.org/olis/2008doc.nsf/LinkTo/NT0000B262/$FILE/JT03269741.PDF},
year = {2009}
}