Comment on Zeeman-Driven Lifshitz Transition: A Model for the   Experimentally Observed Fermi-Surface Reconstruction in YbRh2Si2 (A. Hackl   and M. Vojta, Phys. Rev. Lett. 106, 137002 (2011))
  Comment on Zeeman-Driven Lifshitz Transition: A Model for the Experimentally Observed Fermi-Surface Reconstruction in YbRh2Si2 by A. Hackl and M. Vojta, Phys. Rev. Lett. 106, 137002 (2011). 
V. R. Shaginyan, M. Ya. Amusia, J. W. Clark, A. Z. Msezane, K. G.   Popov, M. V. Zverev, V. A. Khodel
cond-mat.str-el