@article{702143,
     title = {Foreword},
     booktitle = {Proceedings of the 23rd Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2004},
     pages = {[7]-[7]},
     mrnumber = {MR2069393},
     url = {http://dml.mathdoc.fr/item/702143}
}

Slovák, Jan; Čadek, Martin. Foreword, dans Proceedings of the 23rd Winter School "Geometry and Physics", GDML_Books,  (2004), p. [7]. http://gdmltest.u-ga.fr/item/702143/