@article{Christensen2000,
author = {Christensen, K. and McGue, M. and Yashin, A. and Iachine, I. and Holm, N.V. and Vaupel, J.W.},
title= {Genetic and environmental influences on functional abilities in Danish twins aged 75 years and older},
year = {2000},
journal = {Journals of Gerontology: Series A - Biological Sciences and Medical Sciences},
volume = {55},
number = {8},
pages = {M446--M452},
}