@article{Soeb17, author = {S{\"o}bke, H. and Baalsrud Hauge, J. and Stefan, I. A.}, title = {Prime Example Ingress Reframing the Pervasive Game Design Framework (PGDF)}, journal = {International Journal of Serious Games}, year = {2017}, volume = {4}, number = {2}, doi = {10.17083/ijsg.v4i2.182}, pages = {39-58} }