Boyer-Finley equation and systems of hydrodynamic type
  We reduce Boyer-Finley equation to a family of compatible systems of hydrodynamic type, with characteristic speeds expressed in terms of spaces of rational functions. The systems of hydrodynamic type are then solved by the generalized hodograph method, providing solutions of the Boyer-Finley equation including functional parameters. 
E.Ferapontov, D.Korotkin, V.Shramchenko