By Harper   Jr. W F   Moore T L   Russell T L   Turnbull J A   in Journal of Environmental Engineering and Science

ISSN:1496-256X|4|6|497-503

NRC Research Press‎(2005)‎

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By Silver R.K.   Helfand B.T.   Russell T.L.   Ragin A.   Sholl J.S.   MacGregor S.N.   in Fertility and Sterility

ISSN:0015-0282|67|1|30-33

Elsevier‎(1997)‎

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