Cost minimization for periodic maintenance policy of a system subject to slow degradation. - Dong Ho Park; Gi Mun Jung; Joon Keun Yum (Reliab. Eng. Syst. Saf., 2000)

Optimal maintenance policies during the post-warranty period. - Gi Mun Jung; Dong Ho Park (Reliab. Eng. Syst. Saf., 2003)