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Problems in assessing perceived barriers to exercise : confusing obstacles with attributions and excuses / / Lawrence R. Brawley, Kathleen A. Martin and Nancy C. Gyurcsik --
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1998
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1
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Problems in character theory / / Gabriel Navarro --http://www.ams.org/conm/524/http://dx.doi.org/10.1090/conm/524/10350
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2010
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Problems in Childhood Obesity / / Sandra Hassink --7.
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2003
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Problems in Defining Power / / Dennis H. Wrong.2.
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1993
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1
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