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References from Effects of introducing ducks into fish ponds on water quality, natural productivity and fish production together with the economic evaluation of the integrated and non-integrated systems. Local targets link to admitted publications; unresolved targets remain external evidence.
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1989 · External reference
10.1016/0044-8486(80)90040-x
10.1016/0044-8486(80)90040-x · 1980 · External reference
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1988 · External reference
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1981 · External reference
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1978 · External reference
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