Azarbaijan Shahid Madani UniversityCommunications in Combinatorics and Optimization2538-21286120210601A note on polyomino chains with extremum general sum-connectivity index81911410010.22049/cco.2020.26866.1153ENAkbarAliUniversity of Ha&#039;il0000-0001-8160-4196TahirIdreesUniversity of Management and Technology, Sialkot, PakistanJournal Article20200708The general sum-connectivity index of a graph $G$ is defined as $chi_{alpha}(G)= sum_{uvin E(G)} (d_u + d_{v})^{alpha}$ where $d_{u}$ is degree of the vertex $uin V(G)$, $alpha$ is a real number different from $0$ and $uv$ is the edge connecting the vertices $u,v$. In this note, the problem of characterizing the graphs having extremum $chi_{alpha}$ values from a certain collection of polyomino chain graphs is solved for $alpha<0$. The obtained results together with already known results (concerning extremum $chi_{alpha}$ values of polyomino chain graphs) give the complete solution of the aforementioned problem.http://comb-opt.azaruniv.ac.ir/article_14100_a10c261c639facff76ab34a95c3f68f4.pdf