K. Tso-Sutter, L. Marinho, и L. Schmidt-Thieme. Proceedings of 23rd Annual ACM Symposium on Applied Computing (SAC'08), Fortaleza, Brazil, стр. 1995-1999. New York, NY, USA, ACM, (2008)
G. Groh, и C. Ehmig. GROUP '07: Proceedings of the 2007 international ACM conference on Supporting group work, стр. 127--136. New York, NY, USA, ACM, (2007)
K. Tso-Sutter, L. Marinho, и L. Schmidt-Thieme. SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, стр. 1995--1999. New York, NY, USA, ACM, (2008)
G. Groh, и C. Ehmig. GROUP '07: Proceedings of the 2007 international ACM conference on Supporting group work, стр. 127--136. New York, NY, USA, ACM, (2007)