Targeted Unlearning Using Perturbed Sign Gradient Methods With Applications On Medical Images. - George R. Nahass; Zhu Wang; Homa Rashidisabet; Won Hwa Kim; Sasha Hubschman; Jeffrey C. Peterson; Ghasem Yazdanpanah; Chad A. Purnell; Pete Setabutr; Ann Q. Tran; Darvin Yi; Sathya N. Ravi (CoRR, 2025)