@article{701429,
     title = {Foreword},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[7]-[7]},
     url = {http://dml.mathdoc.fr/item/701429}
}

Bureš, J.; Souček, V. Foreword, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), p. [7]. http://gdmltest.u-ga.fr/item/701429/