Investment for process quality improvement and setup cost reduction in an imperfect production process with warranty policy and shortages. - Rekha Guchhait; Bikash Koli Dey; Shaktipada Bhuniya; Baisakhi Ganguly; Buddhadev Mandal; Raj Kumar Bachar; Biswajit Sarkar; Huiming Wee; Kripasindhu Chaudhuri (RAIRO Oper. Res., 2020)