@article{Silm2014,
author = {Silm, S. and Ahas, R.},
title= {Ethnic differences in activity spaces: A study of out-of-home nonemployment activities with mobile phone data},
year = {2014},
doi = {10.1080/00045608.2014.892362},
journal = {Annals of the Association of American Geographers},
volume = {104},
number = {3},
pages = {542‒559},
}