Beery AK,Loo TJ, Zucker I (2008) Day length and estradiol affect same-sex affiliative behavior in the female meadow vole. Horm Behav 54(1): 153–159.
Holopainen J, Helama S, Björkenstam C, Partonen T (2013) Variation and seasonal patterns of suicide mortality in Finland and Sweden since the 1750s. Environ Health Prev Med 18(6): 494–501.
Rojansky N, Benshushan A, Meirsdorf S, Lewin A, Laufer N, Safran A (2000) Seasonal variability in fertilization and embryo quality rates in women undergoing IVF. Fertil Steril 74(3): 476-481.