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  "Title": "Large, Sparse Optimal Matching with Refined Covariate Balance",
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  "Author": "Samuel D. Pimentel",
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      "title": "Large, Sparse Optimal Matching with Refined Covariate Balance",
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        "dist2net.matrix",
        "penalize.near.exact",
        "penalty.update",
        "remove.layer"
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      "title": "Optimal Matching with Refined Covariate Balance",
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