@article{Kelly1987,
author = {Kelly, J.J. },
title= {Improving the comparability of international migration statistics: Contributions by the Conference of European Statisticians from 1971 to date},
year = {1987},
doi = {10.2307/2546502 },
journal = {International Migration Review },
volume = {21},
number = {4},
pages = {1017--1037},
}