SJÖSTRÖM , M.; YNGVE , A.; EKELUND , U.; POORTVLIET , E.; HURTIG-WENNLÖF , A.; NILSSON , A.; HAGSTRÖMER , M.; NYLUND , K.; FASKUNGER , J. Physical activity in groups of Swedish adults. Are the recommendations feasible?. Food & Nutrition Research, p. 123-130, 1 Sep. 2002.