Properties of post-AGB stars with IRAS colors typical of planetary   nebulae
  We have investigated the infrared properties of a sample of objects with IRAS colors typical of planetary nebulae. The selected objects have not yet evolved to the planetary nebula stage since they have no detectable radio continuum emission and they are therefore likely post-AGB stars. 
Griet C. Van de Steene, Peter A.M. van Hoof, Peter R. Wood