4.3 Going further
We feel that the catalogue we have just presented is reasonably complete and covers the key items. For
additional background on many of these topics, we would suggest sources such as the books “Artificial
Black Holes” [470
] and “The Universe in a Helium Droplet” [660
]. For more specific detail, check this
review’s bibliography, and use SPIRES (or the beta version of INSPIRE) to check for recent
developments.