[9]
N. Barton,R. Lien,J. Lunde.Engineering classification of rock masses for the design of tunnel support[J].Rock Mechanics Felsmechanik Mécanique des Roches,1974
[9]
N. Barton,R. Lien,J. Lunde.Engineering classification of rock masses for the design of tunnel support[J].Rock Mechanics Felsmechanik Mécanique des Roches,1974