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Sastra abu-abu adalah bahan dan riset yang dihasilkan oleh organisasi di luar saluran-saluran distribusi dan penerbitan akademik atau komersial tradisional. Jenis publikasi sastra abu-abu umum meliputi laporan (laporan tahunan, riset, laporan teknis, proyek, dll), makalah kerja, dokumen pemerintah, makalah putih dan evaluasi. Organisasi-organisasi yang menghasilkan sastra abu-abu meliputi departemen-departemen dan badan-badan pemerintah, masyarakat sipil atau organisasi non-pemerintah, pusat dan departemen akademik, dan perusahaan dan konsultan swasta.

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