@article{Valkonen1993,
author = {Valkonen, T.},
title= {Problems in the measurement and international comparison of socio-economic differences in mortality},
year = {1993},
doi = {10.1016/0277-9536(93)90403-Q},
journal = {Social Science & Medicine},
volume = {36},
number = {4},
pages = {409--418},
}