@article{700092,
     title = {Variational methods in mathematical theory of viscoelasticity},
     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 = {211-216},
     mrnumber = {MR0353788},
     zbl = {0333.73037},
     url = {http://dml.mathdoc.fr/item/700092}
}

Brilla, Jozef. Variational methods in mathematical theory of viscoelasticity, dans Proceedings of Equadiff III, GDML_Books,  (1973), pp. 211-216. http://gdmltest.u-ga.fr/item/700092/