1. Brecciaroli F, Kolisoja P. Deformation behaviour of railway embankment materials under repeated loading literature review. Finnish Rail Administration, A5/2006. ISBN 952-445-147-6; 2006.
2. Chan FW. Permanent deformation resistance of granular layers in pavements. Ph.D. Thesis, University of Nottingham, Nottingham, UK; 1990.
3. Sphere packings, lattices, and groups;Conway,1993
4. The contact of elastic solids;Hertz;J. Reine Angewandle Mathematik,1882
5. Karg C. Modelling of strain accumulation due to low level vibrations in granular soils. PhD thesis. Gent University; 2007.