It was possible to restrict search in Google Scholar by subject area, e.g. it was possible to select Engineering, Computer Science, and Mathematics in Advanced Scholar Search, which had the same effect as including
as_subj=eng in the url, e.g. like this.
I was able to find the old Advanced Search interface in Google cache:
Here is a larger screenshot from the same cached version.
However, now I am only able to get to Advanced Scholar Search which looks like this:
So my questions are:
- Is it possible to find the option to select subject areas?
- Does adding
as_subj=enghas the same effect as before?
As I learned here, you can still get to the old interface like this:
Anyway, I still would be glad if someone could add official information from Google.
EDIT 2 (2013/03/15): Perhaps I should add that now there is no difference between the behavior of the two links above, so I do not know about any way to access the old interface anymore.