Instability Mechanism and CO 2 Phase Transition in Long–Short Borehole Pressure Relief Control of Narrow Coal Pillars in a Gob-Side Roadway Under Water-Immersed Gentle-Dipping Coal Seam Conditions. - Zhao, Fei; Chen, Dongdong; Liu, Kai; Chang, Yi; Tang, Jiachen; Li, Sining; Liu, Jingyong (Applied Sciences (2076-3417), 2026)