%0 Journal Article %T Opinion similarity and helping: Three field experiments investigating the bases of promotive tension %A Sole, Kenneth %A Marton, Janos %A Hornstein, Harvey A. %A , %J Journal of Experimental Social Psychology %V 11 %N 1 %P 1-13 %@ 0022-1031 %D 1975-01-01 %I Elsevier BV %~ DeepDyve