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Authors:
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Yanxia Sun
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Tshwane University of Technology, Pretoria, South Africa
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Guoyuan Qi
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Tshwane University of Technology, Pretoria, South Africa
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Zenghui Wang
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Tshwane University of Technology, Pretoria, South Africa
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Barend Jacobus van Wyk
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Tshwane University of Technology, Pretoria, South Africa
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Yskandar Hamam
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Tshwane University of Technology, Pretoria, South Africa
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