[Evolution] how to google calendar

["v.spagnolo" <v spagnolo pobox com>]

Hi all,
I'd like to have this calendar,
https://www.google.com/calendar/embed?src=7277puklt1jrieouh2na2o5kl4 group calendar google 
com&gsessionid=ynklpCqxpxWQQA28K2c5ng, in Evolution. 
Making a calendar "On the web" results in a bad file format error. I
tried as "Google" as well, but that asks for a username and the account
belongs to someone else.

I've not found anything in the documentation, did I miss it? Is this
possible?

Cheers,
V