@inproceedings { santos21, booktitle = {20th EPIA Conference on Artificial Intelligence}, keywords = {Intelligent Virtual Agents;Reinforcement Learning;Miscellaneous;}, month = {September}, title = {Ad Hoc Teamwork in the Presence of Non-Stationary Teammates}, year = {2021}, author = {Pedro M. Santos and João Ribeiro and Alberto Sardinha and Francisco S. Melo} }