8ISF.Estimated Value of the Demestic Seed Market in Selected Countries. Http//:www.worldseed.org/cms/medias/file/ResourceCenter/Seed Statistics/Domestic_Market_Value_2010.pdf .
9Normann R,Ramirez R.From value chain to value constellation: designing interactive strategy. Harvard Business . 1993
10Prahalad C K,Hamel G.The Core Competence of the Corporation. Harvard Business . 1990