00687nam a2200205Ia 4500 CTU_226312 210402s9999 xx 000 0 und d 338.06 H667 Hippel, Eric von The sources of innovation Eric von Hippel New York Oxford University Press 1988 1 Overview ; 2 Users as Innovators ; 3 Variations in the Functional Source of Innovation,... Technological innovations,Đổi mới công nghệ Economic aspects,Khia cạnh kinh tế nthai Trung tâm Học liệu Trường Đại học Cần Thơ