@article{PhanEtal16a, author = {NhatHai Phan and Javid Ebrahimi and David Kil and Brigitte Piniewski and Dejing Dou}, title = {{Topic-Aware Physical Activity Propagation in a Health Social Network}}, journal = {{IEEE} Intelligent Systems}, volume = {31}, number = {1}, pages = {5--14}, year = {2016} }