@article{doorwayEtiquette, 
   author={W. Huang and D. Terzopoulos}, 
   journal={IEEE Transactions on Visualization and Computer Graphics}, 
   title={Door and Doorway Etiquette for Virtual Humans}, 
   year={2018}, 
   doi={10.1109/TVCG.2018.2874050}, 
   ISSN={1077-2626} 
}