@Article{nowak-1998b,
  author         = {M. Nowak and K. Sigmund},
  title          = {The Dynamics of Indirect Reciprocity},
  year           = {1998},
  volume         = {194},
  pages          = {561--574},
  annote         = {Second paper of two. TODO: Read Journal version and write summary},
  read-status    = {read},
  journal        = {Journal of Theoretical Biology},
  url            = {http://www.ped.fas.harvard.edu/pdf_files_old/JTB98b.pdf},
  key            = {nowak-1998b}
}