[10]
Determination of air permeability of coal pillars inunderground coalmines .2 SAHAY N,VARMA N K,NARAYAN A,et al. Journal of Mines,Metalsand Fuels . 2004
[10]
Determination of air permeability of coal pillars inunderground coalmines .2 SAHAY N,VARMA N K,NARAYAN A,et al. Journal of Mines,Metalsand Fuels . 2004