@ARTICLE{
author={Horoldagva Batmend,Selenge Tsend-Ayush,Gutman Ivan},
year={2026},
title={Sum of Squares of Vertex Degrees of Simple Planar (n, m)-Graphs},
journal={DISCRETE MATHEMATICS LETTERS},
volume={17},
number={},
pages={81-86},
document_type={Article},
}