Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Mari-Sanna Paukkeri, Marja Ollikainen, Timo Honkela. Assessing user-specific difficulty of documents. Inf. Process. Manage., 49(1):198-212, 2013. [doi]
Abstract is missing.