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1 Cooper TG, "World Health Organization reference values for human semen characteristics" 16 : 231-245, 2010
2 World Health Organization, "WHO laboratory manual for the examination of human semen and semen–cervical mucus interaction" Cambridge University Press 2010
3 World Health Organization, "WHO laboratory manual for the examination of human semen and semen–cervical mucus interaction" Cambridge University Press 1999
4 Statistics Korea, "Vital statistics" Statistics Korea
5 De Rosa M, "Traffic pollutants affect fertility in men" 18 : 1055-1061, 2003
6 Murray KS, "The effect of the new 2010 World Health Organization criteria for semen analyses on male infertility" 98 : 1428-1431, 2012
7 Seo JT, "Semen quality over a 10-year period in 22,249 men in Korea" 23 : 194-198, 2000
8 Selevan SG, "Semen quality and reproductive health of young Czech men exposed to seasonal air pollution" 108 : 887-894, 2000
9 Mukhopadhyay D, "Semen quality and agespecific changes: a study between two decades on 3,729 male partners of couples with normal sperm count and attending an andrology laboratory for infertility-related problems in an Indian city" 93 : 2247-2254, 2010
10 Nelson CM, "Semen analysis: evidence for changing parameters of male fertility potential" 25 : 503-507, 1974
11 Chen Z, "Seasonal variation and age-related changes in human semen parameters" 24 : 226-231, 2003
12 Henderson BE, "Risk factors for cancer of the testis in young men" 23 : 598-602, 1979
13 Swan SH, "Have sperm densities declined? A reanalysis of global trend data" 105 : 1228-1232, 1997
14 Carlsen E, "Evidence for decreasing quality of semen during past 50 years" 305 : 609-613, 1992
15 National Institute of Environmental Research, "Emission statistics" National Institute of Environmental Research
16 Kidd SA, "Effects of male age on semen quality and fertility: a review of the literature" 75 : 237-248, 2001
17 Ashok Agarwal, "Effect of Oxidative Stress on Male Reproduction" 대한남성과학회 32 (32): 1-17, 2014
18 Baker K, "Analysis of semen parameters in male referrals: impact of reference limits, stratification by fertility categories, predictors of change, and comparison of normal semen parameters in subfertile couples" 103 : 59-65.e5, 2015
19 Becker S, "A meta-analysis of 61 sperm count studies revisited" 67 : 1103-1108, 1997