1. The essentials of designing and building on microporous soils;Abelev;Stroital Naya Promyshlemast,1948
2. Environmental hazard from fissures in the Main Ethiopian Rift;Asfaw;J. Afr. Earth Sc.,1998
3. ASTM -03, 2003. Standard Test Method for Measurement of Collapse Potential of Soils (Withdrawn 2012), ASTM International, West Conshohocken, PA, www.astm.org.
4. Ground cracks in Ethiopian Rift Valley: fact and uncertainties;Ayalew;Eng. Geol.,2004
5. Bell, J.W., 1981. Subsidence in Las Vegas Valley: Nevada Bureau of Mines and Geology Bulletin 95, Nevada Bureau of Mines and Geology, Reno, NV, 84 p.