00574nam a2200205Ia 4500 CTU_86630 210402s9999 xx 000 0 und d 384 C454 Ergas, Henry Changing market structures in telecommunications : Proceedings of an OECD Conference Henry Ergas and Jun Okayama Amsterdam North-Holland 1984 Telecommunication Năm CN.003789 Trung tâm Học liệu Trường Đại học Cần Thơ