@article {Gadsden:December 1998:1364-6826:1763,
	author = "Gadsden M.",
	title = "Noctilucent clouds seen at 60oN: origin and development",
	journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
	volume = "60",
	year = "December 1998",
	abstract = "",
	pages = "1763-1772(10)",
	url = "http://www.ingentaconnect.com/content/els/13646826/1998/00000060/00000018/art00154"
	doi = "doi:10.1016/S1364-6826(98)00154-0"
}