@book{Kaprio1979,
author = {Kaprio, J. and Koskenvuo, M. and Artimo, M. and Sarna, S. and Rantasalo, I.},
title= {The Finnish twin registry: Baseline characteristics: Section I: Materials, methods, representativeness and results for variables special to twin studies},
year = {1979},
address = {Helsinki},
publisher = {Helsingin yliopiston monistuspalvelu},
}