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264 0 _c19771130
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040 _aNLM
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245 0 0 _aProductivity.
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260 _bNLN publications
_c1977
300 _aiii-ix, 1-27 p.
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500 _aPublication Type: Journal Article
650 0 4 _aEfficiency
773 0 _tNLN publications
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999 _c238058
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