• A non-linear deformation model for particle impact processPappel, Toivo; Põdra, Priit; Järvpõld, Neeme17th International Baltic Conference : Materials Engineering 2008 : November 6-7, Kaunas, Lithuania : abstracts of papers2008 / p. 12-13
• A non-linear deformation model for particle impact processPappel, Toivo; Põdra, Priit; Järvpõld, NeemeMaterials science = Medžiagotyra2009 / p. 32-34 https://matsc.ktu.lt/index.php/MatSc/article/view/26116