@article{Fihel2018,
author = {Fihel, A. and Janicka, A. and Kloc-Nowak, W.},
title= {The direct and indirect impact of international migration on the population ageing process: A formal analysis and its application to Poland},
year = {2018},
doi = {10.4054/DemRes.2018.38.43},
volume = {38},
number = {43},
pages = {1303--1338},
}