5Stieglitz N. Industry dynamics and types of market convergence[ R] . Paper to be presented at the DRUID Summet Conference on" Industrial Dynamics of the New and Old Economy - who is embracing whom ?" Copenhagen/Elsinore, 2002 : 1 - 6
6Lind J . Convergence : history of term usage and lessons for firm strategies[R] . Stockholm School of Economics, Center for Information and Communications Research ,2004
7Toffel. Contracting for Servicizing[ R]. Working Paper, 2002
8Hockers K. Innovation of eco - efficient service : increasing the efficiency of products and services[ A]. Charter, M J ( Eds. ). Greener marketing[ C]. Sheffield: Greenleaf, 1999
