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Semmer, Norbert K.; Elfering, Achim; Jacobshagen, Nicola; Perrot, Tanja; Beehr, Terry A.; Boos, Norbert (2008). The emotional meaning of instrumental social support. International journal of stress management, 15(3), pp. 235-251. New York, N.Y.: American Psychological Association 10.1037/1072-5245.15.3.235
