The authors develop a simple test to assess whether horizontal spillover effects from multinational to domestic firms are endogenous to the market structure generated by the entry of the same multinationals.
Link
http://econpapers.repec.org/scripts/redir.pl?u=http%3A%2F%2Fwww.tinbergen.nl%2Fdiscussionpapers%2F05101.pdf;h=repec:dgr:uvatin:20050101