@book{
  author = "Trieste Spring School, Dijkgraaf, R.",
  title = "String theory, gauge theory and quantum gravity '93 : proceedings of the Trieste Spring School & Workshop ICTP, Trieste, Italy, April 19-29, 1993",
  year: c1994
  publisher = "World Scientific",
  address = "Singapore",
  ISSN/ISBN = "9789810218065 [9810218060]",
}