@article{Montag2015,
author = {Montag, C. and Błaszkiewicz, K. and Sariyska, R. and Lachmann, B. and Andone, I. and Trendafilov, B. and Eibes, M. and Markowetz, A.},
title= {Smartphone usage in the 21st century: Who is active on WhatsApp?},
year = {2015},
doi = {10.1186/s13104-015-1280-z},
journal = {BMC Research Notes },
volume = {8},
number = {1},
pages = {1--6},
}