@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},
year = {2000},
doi = {10.1093/gerona/55.8.M446},
journal = {Journal of Gerontology: Biological and Medical Sciences},
volume = {55},
number = {8},
pages = {M446--M452},
}