@article{Olson2000,
author = {Olson, G.M.  and Olson, J.S.},
title= {Distance Matters},
year = {2000},
doi = {10.1207/S15327051HCI1523_4},
journal = {Human-Computer Interaction},
volume = {15},
number = {2/3},
pages = {139--178},
}