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4. Ižvolt, L., Dobeš, P., Pitoňák, M.: Some experience and preliminary conclusions from the experimental monitoring of temperature regime of subgrade structure, Computer in railways XIV, ISBN 978-1-84564-766-7. - S. 267-278.
5. Kupčuliak, P.: Design and evaluation of railway subgrade structure of aspect of climatic load factors (Návrh a posúdenie konštrukcie podvalového podložia z aspektu zaťaženia klimatickými faktormi), (Dissertation thesis). University of Žilina, Faculty of Civil Engineering, Department of Railway Engineering and Track Management, 2011. (In Slovak).