Some comments on Wojcik's hypothesis
  Wojcik's hypothesis has been mentioned on page 32 of the text S.Piekarski, "Galilean-Invariant Formulation of the Fluid Mechanics", IFTR REPORTS, 7/2007. Here we discuss it in more detail. Our main is to show that the form of the restrictions imposed by the Gibbs identity can depend on the choice of coordinates. The possible reactions for this unpleasant fact are shortly discused 
S. Piekarski and J. Wojcik
physics.flu-dyn