@article{Olds2010,
author = {Olds, T. and Blunden, S. and Petkov, J. and Forchino, F.},
title= {The relationships between sex, age, geography and time in bed in adolescents: A meta-analysis of data from 23 countries},
year = {2010},
doi = {10.1016/j.smrv.2009.12.002},
volume = {14},
number = {6},
pages = {371--378},
}