@article {311041,
	title = {Opposite effects of maternal and paternal grandmothers on infant survival in historical Krummh{\"o}rn},
	journal = {Behavioral Ecology and Sociobiology},
	volume = {52},
	year = {2002},
	pages = {435{\textendash}443},
	author = {Voland, Eckart and Beise, Jan}
}
