@article{Gyllenborg1999,
author = {Gyllenborg, J. and Skakkebæk, N.W. and Nielsen, N.C. and Keiding, N. and Giwercman, A.},
title= {Secular and seasonal changes in semen quality among young Danish men: A statistical analysis of semen samples from 1927 donor candidates during 1977–1995},
year = {1999},
doi = {10.1046/j.1365-2605.1999.00137.x},
volume = {22},
number = {1},
pages = {28--36},
}