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"

    Loukkola, T., &

                                                                                  Zhang,2010

    Commission of the European Communitie,2011,43

                                                   Ehlers and Pawlowski

    Ehlers &

                                                                                  Pawlowski,2014,15

                        668 2009

                                                                         : ‫الدراسات السابقة‬

                                                   Sangrà &Michels,2011           1

10                                                                                2

                                                   Ossiannilsson & Landgren,2012

           20082010
10
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