1. K. Terzaghi and R. B. Peck, Soil Mechanics in Engineering Practice, Wiley, New York (1967).
2. W. Fellenius, “Calculation of the stability of earth dams,” Trans. 2nd Congr. Large Dams, Washington D.C., 4, 445-459 (1936).
3. A. W. Bishop, “The use of the slip circle in the stability analysis of slopes,” Geotechnique, 5, 7-17 (1955).
4. N. Janbu, “Slope Stability Computations,” In: Embankment Dam Engineering, Wiley, New York (1973).
5. E. Spencer, “A method of analysis of the stability of embankments assuming parallel inter-slice forces,” Geotechnique, 17, 11-26 (1967).