Ok, You're totally right. That's why I decided to not use ScienceDirect but link springer, and now the problem is different I think.

I was late with editing one of my comments. Actually i tried two doi of two articles on Link springer(without "agent=> 'MyApp/0.1'").

http://dx.doi.org/10.1007/s00601-015-1012-x
and
http://dx.doi.org/10.1007/BF02579652
[download]

The first work doesn't work like I said, and the second one is working perfectly. They both are redirecting to Link Springer, and in both cases I didn't use any way around - just simple getting xml.