For citations:

Pham D., Vitcalov V.G. Determination of optimal block length along the strike to provide safety and efficiency when extracting medium-thick in-clined coal seams using room-and-pillar method in Quang Ninh Coal Basin. Mining Science and Technology (Russia). 2018;(2):3-8. https://doi.org/10.17073/2500-0632-2018-2-3-7