@article{Keilman1985,
author = {Keilman, N.},
title= {Nuptiality models and the two-sex problem in national population forecasts},
year = {1985},
doi = {10.1007/BF01796933},
journal = {European Journal of Population},
volume = {1},
number = {2-3},
pages = {207--235},
}