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author_ss:"Biswas, S.C."
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theme_ss:"Preserved Context Index System (PRECIS)"
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year_i:[1980 TO 1990}
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Mahapatra, M.; Biswas, S.C.: PRECIS: its history and application : an extented state-of-the-art review from the beginning up to 1982 (1983)
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Mahapatra, M.; Biswas, S.C.: Efficiency of PRECIS role operators (1984)
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