@techreport{Voland2001,
author = {Voland, E. and Beise, J.},
title= {Opposite Effects of Maternal and Paternal Grandmothers on Infant Survival in Historical Krummhörn},
year = {2001},
publisher = {Max Planck Institute for Demographic Research},
address = {Rostock},
number = {MPIDR working paper; WP-2001-026},
}