 Significant amounts of newer work on self-reference has gone into trying to make a complete graph-theoretical characterisation of which structures of reference admit paradoxes, including Rabern and Macauley (2013), Cook (2014) and Dyrkolbotn and Walicki (2014). A complete characterisation is still an open problem (Rabern, Rabern and Macauley, 2013), but it seems to be a relatively widespread conjecture that all paradoxical graphs of reference are either cyclic or contain a Yablo-like structure. If this conjecture turns out to be true, it would mean that in terms of structure of reference, all paradoxes of reference are either liar-like or Yablo-like. The precise characterisation of what it means to be a “Yablo-like structure” is still discussed.