Contact surgeries and the transverse invariant in knot Floer homology
  We study naturality properties of the transverse invariant in knot Floer homology under contact (+1)-surgery. This can be used as a calculational tool for the transverse invariant. As a consequence, we show that the Eliashberg-Chekanov twist knots E_n are not transversely simple for n odd and n>3. 
Peter Ozsvath and Andras Stipsicz