1. TNŽ 73 6312, Design of subgrade construction layers, Standard of Slovak Railway (2005)
2. STN EN ISO 10 456, Construction materials and products. Hygrothermal properties. Tabulated design (calculated) values and procedures for the determination of declared and design values of thermal quantities (2007)
3. Dobeš P., Optimization of the subgrade design for non-traffic load (Dissertation thesis), ). University of Žilina, Faculty of Civil Engineering, Department of Railway Engineering and Track Management (2015)
4. http://fyzika.jreichl.com/main.article/view/578-merna-tepelna-kapacita
5. http://finistav.sk/katalog/vyrobok/liapor