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2. CCITT. Draft Recommendation T.6, Facsimile coding schemes and coding control functions, CCITT Document AP VII-37-E.
3. A progressive coding scheme for facsimile images, Papers of Technical Group on Image Engineering;Endo;I.E.C.E., Japan,1983
4. Evaluation of a progressive coding scheme, Papers of Technical Group Image Engineering;Endo;I.E.C.E., Japan,1984