1. American Society for Testing and Materials. ASTM D2487-00: Standard Classification of Soils for Engineering Purposes.
2. Soft ground improvement: in lowland and other environments-ASCE Publications (1996);Bergado,1996
3. Bujulu, P.M.S., Sorta, A.R., Priol, G., and Emdal, A.J. 2007. Potential of wastepaper sludge ash to replace cement in deep stabilization of quick clay. In The 2007 Annual Conference of the Transportation Association of Canada - “Characterization and Improvement of Soils and Materials.” Transportation Association of Canada, Saskatoon.
4. Stabilization treatment of soft subgrade soil by sewage sludge ash and cement;Chen;J. Hazard. Mater.,2009
5. Influence of sand impurities in cement-treated clays;Chian;Geotechnique,2017