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  <controlfield tag="008">210402s9999    xx            000 0 und d</controlfield>
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   <subfield code="a">Giáo trình mã hóa thông tin :</subfield>
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   <subfield code="b">Lý thuyết và ứng dụng</subfield>
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   <subfield code="a">Hà Nội</subfield>
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   <subfield code="a">Trung tâm Học liệu Trường Đại học Cần Thơ</subfield>
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