apt-get, dselect and LAN authentication

[Vittorio <vdemart@supereva.it>]

At office I have a Win NT Lan with a proxy requiring authentication
(username and password).

I've read the doc of apt-get and dselect but I couldn't find anything
about these settings.

Is there any way to use apt-get and dselect with this kind of
connection?

Ciao
Vittorio