@InBook{donninger-1986a,
  author         = {C. Donninger},
  title          = {Paradoxical Effects of Social Behavior},
  year           = {1986},
  chapter        = {Is it always efficient to be nice?},
  editor         = {A. Dickmann and P. Mitter},
  publisher      = {Heidelberg: Physica Verlag},
  pages          = {123--134},
  annote         = {Ref'd from kraines-1993a},
  key            = {donninger-1986a}
}