With BibDesk, you can search the NCBI's Entrez set of databases, the catalogs at many research libraries using the z39.50 protocol, the Web of Knowledge, and the DBLP Computer Science Bibliography.
To search these databases, select "New Search Group" from the "Searches" menu and select the desired search from the menu that appears.
|Syntax for Z39.50 Searching|
|Syntax for Entrez Searching|
|Syntax for WOK Searching|