Bounds for signed double Roman k-domination in treesHong Yang, Pu Wu, Sakineh Nazari-Moghaddam, Seyed Mahmoud Sheikholeslami, Xiaosong Zhang, Zehui Shao and Yuan Yan TangRAIRO-Oper. Res., 53 2 (2019) 627-643DOI: https://doi.org/10.1051/ro/2018043
