A new paper outlines some of the insights that can be learned through matching of patents and business databases as a complement to much of the Community Innovation Survey work in Europe.  While I didn't find the paper to go very deeply into the issue, its pan-Nordic scope of consideration was unique to the papers that I have seen in this area.  

• Small Nordic Enterprises - developing IPR in global competition. Eric J. Iversen, Iiro Mäkinen, Hans Lööf, Dong-hyun Oh, Svend T. Jespersen, Martin Junge and Jonas Bech. http://cesis.abe.kth.se/documents/WP178.pdf

One issue which the researchers didn't deal with in very much detail was the impact on their research of having to use Amadeus data instead of business register data for two countries.  While researchers have little choice except to mix data sources, I do wonder what impacts this has on our understanding.  Amadeus is becoming so heavily used in Europe, in international organizations, and even now by U.S. scholars doing cross-country work, but I would still like to understand more about its similarities and differences by country to other data sources.  If anyone has references here, I'd welcome them.