Cheng, J., and et al. Potassium doping effect on the lattice softening and electronic structure of Ba1-xKxFe2As2 probed by X-ray absorption spectroscopy. J. Synchrotron Rad. 17, 730 (2010).
 Cheng, J., and et al. Quantum critical point in SmO1-xFxFeAs and oxygen vacancy induced by high fluorine dopant. J. Synchrotron Rad. 18, 723 (2011).  Cheng, J., and et al.. Charge redistribution and local lattice structure of (F, Zn)-codoped LaFeAsO superconductor. New J. Phys. 14, 033005 (2012)