共 50 条
- [2] INFORMATION MARKET AND COMPLEX INFORMATION PRODUCTS [J]. NAUCHNO-TEKHNICHESKAYA INFORMATSIYA SERIYA 1-ORGANIZATSIYA I METODIKA INFORMATSIONNOI RABOTY, 1992, (3-4): : 64 - 65
- [3] European information services market [J]. JOURNAL OF INFORMATION SCIENCE, 1998, 24 (01) : 63 - 64
- [6] PRICING INFORMATION PRODUCTS AND SERVICES [J]. DREXEL LIBRARY QUARTERLY, 1981, 17 (02): : 99 - 107
- [7] The market for stress management products & services [J]. STRESS MEDICINE, 1997, 13 (03): : 205 - 206
- [9] The Demand for Information Services and the Market Structure [J]. Journal of Economics, 2002, 77 : 155 - 183