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A SECOND-GENERATION INTERACTIVE CLASSROOM TELEVISION SYSTEM FOR THE PARTIALLY SIGHTEDGENENSKY SM; PETERSEN HE; CLEWETT RW et al.1978; AMER. J. OPTOM. PHYSIOL. OPT.; USA; DA. 1978; VOL. 55; NO 9; PP. 615-626; BIBL. 5 REF.Article

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