@article{Spéder2001,
author = {Spéder, Z.},
title= {Turning points of the life course. Concept and design of the Hungarian social and demographic panel survey},
year = {2001},
URL = {http://www.dpa.demografia.hu},
journal = {Demográfia},
volume = {44},
number = {2-3},
pages = {305--320},
}