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This article has been cited by the following article(s):

The relationship between some seminal characteristics and ejaculation frequency in the human male

C. van Duijn and M. Freund
European Journal of Obstetrics & Gynecology 1 (5) 167 (1971)
DOI: 10.1016/0028-2243(71)90036-0
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Movement characteristics of human spermatozoa analysed from kinemicrographs

C. van Duijn, C. van Voorst and M. Freund
European Journal of Obstetrics & Gynecology 1 (4) 121 (1971)
DOI: 10.1016/0028-2243(71)90051-7
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A Microcomputer-Photographic Method for Evaluation of Motility and Velocity of Bull Sperm

P.R. Budworth, R.P. Amann and R.H. Hammerstedt
Journal of Dairy Science 70 (9) 1927 (1987)
DOI: 10.3168/jds.S0022-0302(87)80233-3
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An Improved Microscopical Method for Determining the Numbers of Motile and Non-Motile Spermatozoa

C. VOORST and C. DUIJN
Andrologia 6 (3) 211 (2009)
DOI: 10.1111/j.1439-0272.1974.tb01206.x
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