Our service, http://research.easybib.com, is a search engine used by students to find sources for their research. Our users are primarily between the ages of 14 and 22 who are in high school or university writing research papers.
The index is comprised of the citations these users have entered into our database. If we remove the existing entries, it's possible they'll come in again, so it's hard for us to 'block' sites from the index.
From our own SEO research, there's no impact that we can make on your SEO. We use rel=nofollow on all of our links to remove any impact of them. Let us know if you have any questions or concerns.