@article{701762,
     title = {Foreword},
     booktitle = {Proceedings of the 25th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2006},
     pages = {[7]-[7]},
     url = {http://dml.mathdoc.fr/item/701762}
}

Čadek, Martin. Foreword, dans Proceedings of the 25th Winter School "Geometry and Physics", GDML_Books,  (2006), p. [7]. http://gdmltest.u-ga.fr/item/701762/