Onsager theory of length-bidisperse hard rods: Evidence for a   nematic-nematic critical point
  This manuscript has been withdrawn because of significant overlap with an existing paper (Szabolcs Varga and Istvan Szalai, "Phase diagrams of binary mixtures of hard rods in an external orientational field", Phys. Chem. Chem. Phys., 2:1955-1959, 2000) of which we were, unfortunately, unaware when submitting our manuscript. 
Alessandro Speranza and Peter Sollich