F. Harper, D. Raban, S. Rafaeli, and J. Konstan. Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 865--874. New York, NY, USA, ACM, (2008)
F. Harper, D. Raban, S. Rafaeli, and J. Konstan. Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 865--874. New York, NY, USA, ACM, (2008)