@article{Willekens1982,
author = {Willekens, F.J. and Shah, I. and Shah, J. and Ramachandran, P.},
title= {Multi-state analysis of marital status life tables: Theory and application},
year = {1982},
doi = {10.2307/2174163},
journal = {Population Studies},
volume = {36},
number = {1},
pages = {129−144},
}