This paper outlines the growth in popularity of vertical search engines, their origins, the differences between them and well-known broad based search engines such as Google and Yahoo. We also discuss their use in business-to-business, their marketing and advertising costs, what the revenue streams are and who uses them.
Curran, Kevin and Mc Glinchey, Jude
"Vertical Search Engines,"
The ITB Journal:
2, Article 4.
Available at: http://arrow.dit.ie/itbj/vol8/iss2/4