On maximal Roman domination in graphs: complexity and algorithms Zehui Shao, Yonghao Song, Qiyun Liu, Zhixing Duan and Huiqin Jiang RAIRO-Oper. Res., 58 4 (2024) 2709-2731 Published online: 02 July 2024 DOI: 10.1051/ro/2024038