On the signed $2$-independence number of graphs

od Moghaddam, S.M. Hosseini; Qom Azad University, Qom, Iran, Mojdeh, D.A.; Department of Mathematics, University of Mazandaran, Babolsar, Iran, Samadi, Babak; Department of Mathematics, University of Mazandaran, Babolsar, Iran, Volkmann, Lutz; Lehrstuhl II f\"{u}r Mathematik, RWTH Aachen University, 52056 Aachen, Germany
Wydane 2017