@article{Keiding2011,
author = {Keiding, N.},
title= {Age-period-cohort analysis in the 1870s: Diagrams, stereograms, and the basic differential equation},
year = {2011},
doi = {10.1002/cjs.10121},
journal = {Canadian Journal of Statistics},
volume = {39},
number = {3},
pages = {405--420},
}