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.
Hyo-Jeong So. When groups decide to use asynchronous online discussions: collaborative learning and social presence under a voluntary participation structure. J. Comp. Assisted Learning, 25(2):143-160, 2009. [doi]
Abstract is missing.