@article {9438,
	title = {Similar zone-center gaps in the low-energy spin-wave spectra of Na 1-δFeAs and BaFe 2As 2},
	journal = {Physical Review B - Condensed Matter and Materials Physics},
	year = {2012},
	doi = {10.1103/PhysRevB.86.024437},
	author = {J.T. Park and G. Friemel and T. Loew and V. Hinkov and Yuan Li and B.H. Min and D.L. Sun and A. Ivanov and A. Piovano and C.T. Lin and B. Keimer and Y.S. Kwon and D.S. Inosov}
}
