@article{701624,
     title = {Foreword},
     booktitle = {Proceedings of the 18th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1999},
     pages = {11-11},
     url = {http://dml.mathdoc.fr/item/701624}
}

Slovák, Jan; Čadek, Martin. Foreword, dans Proceedings of the 18th Winter School "Geometry and Physics", GDML_Books,  (1999), p. 11. http://gdmltest.u-ga.fr/item/701624/