1. Patent pools
2. Essential patents in pools: Is value intrinsic or induced ?;? Cournot;Recherches sur les principes math�matiques de la th�orie des richesses ? Delcamp,1838
3. Market value and patent citations;V Dequiedt;Patent Pools and the Dynamic Incentives to R&D, Working Paper ? Hall Bronwyn H., Jaffe A., Trajtenberg M,2005