@ARTICLE{
author={Atanackovic Teodor M,Guran A,Spasic Dragan T},
year={2000},
title={A variational principle for equation of Hertz's theory of impact},
journal={PROCEEDINGS OF THE THE FIRST INTERNATIONAL SYMPOSIUM ON IMPACT AND FRICTION OF SOLIDS, STRUCTURES AND INTELLIGENT MACHINES - IN MEMORIAM P. D. PANAGIOTOPOULOS (1950-1998)},
volume={14},
number={},
pages={207-210},
document_type={Proceedings Paper},
}