Keberlanjutan Perdagangan Karet Alam Indonesia ke Pasar Strategis: Perbandingan OLS Dan PPML dalam Regresi Data Panel: The Sustainability of Indonesian Natural Rubber Trade in Strategic Markets: A Comparison of OLS and PPML in Panel Data Regression. (2026). Indonesian Journal of Agricultural Resource and Environmental Economics, 5(1), 52-66. https://doi.org/10.29244/jgesms61