Wimonmas Lengbamrung, and Adisak Pongpullponsak. “A Study of Optimal Burn-In Time to Minimize Cost for a Series System Sold Under Warranty”. Agriculture and Natural Resources 43, no. 5 (December 31, 2009): 392–398. accessed September 12, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/244849.