Graph-Based Machine Learning Estimation Methods for Backbone Optical Network Optimization. - Aleksandra Knapinska; Jakub Derda; Franciszek Strasburger; Szymon Wojciechowski; Jakub Klikowski; Piotr Lechowicz; Krzysztof Walkowiak (IEEE Trans. Cogn. Commun. Netw., 2026)