@article{Martikainen1999,
author = {Martikainen, P. and Valkonen, T.},
title= {Diminishing educational differences in breast cancer mortality among Finnish women: register-based 25-year follow-up},
year = {1999},
doi = {10.2105/AJPH.90.2.277},
journal = {American Journal of Public Health},
volume = {90},
number = {2},
pages = {277--280},
}