Optimal age-replacement policy for nonrepairable products under renewing free-replacement warranty. - Ruey-Huei Yeh; Gaung-Cheng Chen; Ming-Yuh Chen (IEEE Trans. Reliab., 2005)

Optimal periodic replacement policy for repairable products under free-repair warranty. - Ruey-Huei Yeh; Ming-Yuh Chen; Chen-Yi Lin (Eur. J. Oper. Res., 2007)