@article{700071,
     title = {Preface},
     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 = {9-9},
     url = {http://dml.mathdoc.fr/item/700071}
}

Ráb, Miloš; Vosmanský, Jaromír. Preface, dans Proceedings of Equadiff III, GDML_Books,  (1973), p. 9. http://gdmltest.u-ga.fr/item/700071/