@article{Frejka2001,
author = {Frejka, T. and Calot, G.},
title= {Cohort reproductive patterns in the Nordic countries},
year = {2001},
doi = {10.4054/DemRes.2001.5.5},
journal = {Demographic Research},
volume = {5},
number = {5},
pages = {125--186},
}