Free Determination of the Effect of Blasting Holes Diameter on the Seismicity Coefficient at Mass Explosions near the Protected Objects at «Nuybeo» Coal Pit of Kuang Ning Province of Vietnam Chan Kuang Khieu, Belin V.A., Bui Xuan Nam DOI: 10.24000/0409-2961-2017-7-13-16 Year: 2017 Issue num: 7 more