@article{van Imhoff2000,
author = {van Imhoff, E. and Keilman, N.},
title= {On the quantum and tempo of fertility: Comment},
year = {2000},
doi = {10.1111/j.1728-4457.2000.00549.x},
journal = {Population and Development Review},
volume = {26},
number = {3},
pages = {549--553},
}