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3. The use of the slip circle in the stability analysis of slopes;Bishop;Geotechnique,1955
4. Brandl, H. (1973) ’Die Verwendung von anstehendem Felsgestein im Straβenbau, Straßen- und Tiefbau, No. 8, Switzerland
5. Brandl, H. (1979) ‘Design of high, flexible retaining structures in steeply inclined, unstable slopes’ Proc. 7th Eur. Conf. Soil Mech. Found. Engg, Brighton