Diameters of Mira Stars Measured Simultenously in the J,H,K'   Near-Infrared Bands
  We present the first spatially resolved observations of a sample of 23 Mira stars simultaneously measured in the near-infrared J, H and K' bands. The technique used was optical long baseline interferometry, and we present for each star visibility amplitude measurements as a function of wavelength. We also present characteristic sizes at each spectral band, obtained by fitting the measured visibilities to a simple uniform disk model. This approach reveals the general relation J diameter < H diameter < K' diameter. 
R. Millan-Gabet, E. Pedretti, J. D. Monnier, F. P. Schloerb, W. A.   Traub, N. P. Carleton, M. G. Lacasse and D. Segransan