Remarks on the outer-independent double Italian domination number
Opuscula Math. 41 (2021), 259--268.
BibTex references
@Article\{Vol21b,
author = "Volkmann, Lutz",
title = "Remarks on the outer-independent double Italian domination number",
journal = "Opuscula Math.",
volume = "41",
pages = "259--268",
year = "2021",
}