00605nam a2200217Ia 4500 CTU_85296 210402s9999 xx 000 0 und d 338 S253 Sato, Ryuzo Research and productivity : Endogenous technical change Ryuzo Sato and Gilbert S. Suzawa Boston Auburn House Publishing Company 1983 Technology innovation Economic aspects United states Năm Trung tâm Học liệu Trường Đại học Cần Thơ