Influence of the strip-shaped air-out slits’ width in the fully mechanized working face under wallattached swirling ventilation conditionYongjun Li, Pengfei Wang, Ronghua Liu, Han Han, Xuanhao Tan and Yidan JiangE3S Web Conf., 81 (2019) 01016DOI: https://doi.org/10.1051/e3sconf/20198101016