1. Barsvary, AK., Klym, T.W., Franklin, J.A., 1980, List of terms, symbols and recognized SI units and multiples for geotechnical engineering, Canadian Geotechnical Journal. 17:89–96.
2. Brunsden, D., Thomes, J.B., 1979. Landscape sensitivity and change, Transactions Institute of British Geographers. 4: 463–484.
3. Callaway, C., 1879. On plagioclinal mountains, Geological Magazine. 15:216–221.
4. Canada Department of Agriculture Publication;Canada Soil Survey Committee,1978
5. Cruden, D.M., 1975. The influence of discontinuities on the stability of rock slopes, Proceedings, 4th Guelph Symposium on Geomorphology, Geoabstracts, Norwich pp. 57–67.