How long does the surplus stay close to its historical high?

Bo Lia School of Mathematics and LPMC, Nankai University, Tianjin, People's Republic of ChinaView further author information

Yun Huaa School of Mathematics and LPMC, Nankai University, Tianjin, People's Republic of ChinaView further author information

Xiaowen Zhoub Department of Mathematics and Statistics, Concordia University, Montreal, CanadaCorrespondence[email protected]
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How long does the surplus stay close to its historical high?

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How long does the surplus stay close to its historical high?

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