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)
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)