【作者(必填)】Hall, Bronwyn,  Christian Helmers,  Mark Rogers, and  Vania Sena.

【文题(必填)】The Choice between Formal and Informal Intellectual Property: A Review
【年份(必填)】 2014.

【全文链接或数据库名称(选填)】Journal of Economic Literature, 52(2): 375-423.
http://www.aeaweb.org/articles.php?doi=10.1257/jel.52.2.375