By Overman A. R.   Scholtz R. V.   in Journal of Plant Nutrition

ISSN:0190-4167|37|7|1080-1092

Taylor & Francis Ltd‎(2014)‎

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By Overman Pamela R   in Journal of Dental Hygiene

ISSN:1553-0205|81|3|66-66

American Dental Hygienists' Association‎(2007)‎

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