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Tier 2
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Original research — experimental, observational, or case-control study. Direct primary evidence.
Environmental Sources
Policy & Risk
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A Spatial Cross-Validation Framework for Environmental Machine Learning: Quantifying Geographic Confounding in Global Soil Microplastic Prediction
SSRN Electronic Journal
2026
Kerage Dorothy Mokeira,
Yao Zhao,
Ologun Sodiq Babatunde,
Abubakar Aisha Gide,
Xuelian Wang,
Chengyun Huang,
Shuxia Xu,
Shuxia Xu
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