21
by Brackbill, Robert M.
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

22
by Mackenzie, John
Published 2019
MDPI - Multidisciplinary Digital Publishing Institute

23
by Kabata-Pendias, Alina
Published 2015
Taylor & Francis

25
Published 2000
National Academies Press

26
Published 2008
National Academies Press

27
Published 1988
National Academy Press

29
by Bonnie, Richard J.
Published 1999
National Academy Press

30
Published 1998
National Academy Press

32
Published 2000
National Academy Press

34
Published 2013
The National Academies Press

35
Published 2010
Department of Reproductive Health and Research, World Health Organization

36
by Coussens, Christine, Rusch, Erin
Published 2013
National Academies Press

37
by Pool, Robert
Published 2014
National Academies Press (US)

38
Published 2013
The National Academies Press

39
Published 1999
National Academy Press

40
by Watson, Ann Y.
Published 1988
National Academy Press