2Lucio Picci, (2010), "The Interna- tionalization of Inventive Activity: A Gravity Model Using Patent Data", Re- search Policy, Vo139, pp.1070-1081.
3William K. Hutchinson, (2002), "Does Ease of Communication Increase Trade Commonality of Language and Bi- lateral Trade", Scottish Journal of Politi- cal Economy, Vo149, pp.544-555.
4A.Marvasti, (1994), "International Trade in Cultural Goods: A Cross-Sec- tional Analysis", Journal of Cultural E- conomics, Vol18, pp.135-148.
