I can download this by hand in IE.
http://scholar.google.com/scholar.ris?q=info:j8ymU9rzMsEJ:scholar.google.com/&output=citation&hl=zh-CN&as_sdt=2000&
The key to solving this for me was to do the request once via code, a second time in the browser, log both requests with Fiddler and ensure the headers match up.
I ended up having to add headers for:
I hope this helps people in the future.