9Goodman R. E&Shi Genhua. Block Theory and Its Application to Rock. Engineering [M]. Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1995
10Unwedge User's Guide, 3D visualization of potentially unstable wedges in the rock surrounding underground excavations and calculation of safety and support requirements for these wedges [C], 1992-1999 Rocscience, INc
