@article{700093,
     title = {The accuracy of Dafermos' method for nonlinear hyperbolic equations},
     booktitle = {Proceedings of Equadiff III},
     series = {GDML\_Books},
     publisher = {Univ. J. E. Purkyn\v e - P\v r\'\i rodov\v edeck\'a fakulta},
     address = {Brno},
     year = {1973},
     pages = {175-178},
     mrnumber = {MR0346338},
     zbl = {0318.65042},
     url = {http://dml.mathdoc.fr/item/700093}
}

Hedstrom, Gerald W. The accuracy of Dafermos' method for nonlinear hyperbolic equations, dans Proceedings of Equadiff III, GDML_Books,  (1973), pp. 175-178. http://gdmltest.u-ga.fr/item/700093/