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Fig 1.

The network of patent citations.

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Fig 2.

Patent citation network for the green patents (LEDs).

Note: Red dots represent highly-cited green patents.

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Table 1.

Descriptive statistics.

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Table 1 Expand

Table 2.

Results of logistic regression analysis.

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Table 3.

Results of robustness check.

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Table 3 Expand

Fig 3.

The classification for the green patent.

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Fig 3 Expand