1. CIRS Centro Sperimentale Interuniversitario di Ricerca Stradale (2001). Studio a Carattere pre Normativo delle Norme Tecniche di Tipo Prestazionale per Capitolati Speciali d’Appalto. Document approved by the Commission study for the Specification on road materials and design, construction and maintenance of the CNR (Consorzio Nazionale Ricerche).
2. Stark D.T., Arellano D., Horvath J.S., Leshchinsky (2004). Guideline and Recommended Standard for Geofoam Applications in Highway Embankments. National Cooperative Highway Research Program NCHRP Report 529, Transportation Research Board Washington DC.
3. Budhu M. (2010). Soil Mechanics and Foundation – 3rd Edition” John Wiley & Sons Inc., ISBN 978-040-55684-9.
4. Terzaghi K., Peck R.B., Mesri G. (1996). Soil Mechanics in Engineering Practice. 3rd edition” John Wiley and Sons Inc. New York.
5. AA.VV. (1994). Settlement analysis. Technical Engineering and Design Guide as Adapted from the U.S. Army Corps of Engineering N°9 ASCE. New York.