Garus, S. and Jurczyńska, A. 2025. The Influence of the Filling Factor on the Formation of Local Resonance Regions in a Two-Dimensional Phononic Hexagonal Structure. Acta Physica Polonica A ISSN 1898-794X . 147, 3 (Apr. 2025), 172. DOI:https://doi.org/10.12693/APhysPolA.147.172.