Signed domination and Mycielski’s structure in graphs Arezoo N. Ghameshlou, Athena Shaminezhad, Ebrahim Vatandoost and Abdollah Khodkar RAIRO-Oper. Res., 54 4 (2020) 1077-1086 Published online: 20 May 2020 DOI: 10.1051/ro/2019109