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the http:// has to be there at least in yahoo.
Normally very few instances of such does not have an actual link to the site example.com.
Dont agree our site is example.de Google omits the . and the results are mostly in french example de bla bla bla.
Example de Universite etc. Also tried it with quotes .. although I would be happy about the 2,620,000 backlinks lol. No need for G then..
The command: link "domain.com" does work better on google and on yahoo the command:-
link [domain.com...] works best.