@inbook{Notkola1993,
author = {Notkola, I.L.},
title= {Abortions and previous births},
year = {1993},
editor = {OFS (Official Statistics of Finland)},
booktitle = {Health. Induced abortions in Finland until 1991},
address = {Helsinki},
publisher = {STAKES},
pages = {71--87},
}