7Construction and Utilization of Rock Caverns in Singapore--Planning and Location Selection.J.Zhao and K.W.Lee[J].Tunnelling and Underground Space Technology,vol11,No.1,pp81-84.1996
8Underground Space in Land-use Planning.Kimmo Ronka,Jouko Ritola and Kari Rauhala[J].Tunnelling and Underground Space Technology,vol13,No.1,pp39-49.1998