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Mohd Iqbal Muttaqin, Oktalia Triananda Lovita, Zharifah Muthiah, Khairunnisa, and Ira Sharfina, “Adaptive Fiscal Policy for Indonesian Coffee: A Reduced State-Space Linear Quadratic Tracking Approach”, JI, vol. 11, no. 1, pp. 59-65, Jan. 2026.