X.  Cao, Wang, N , Magdassi, S. , Mandler, D, and Long, Y. . 2014. ?Europium Doped Vanadium Dioxide Material: Reduced Phase Transition Temperature, Enhanced Luminous Transmittance And Solar Modulation.?. Sci. Adv. Mater.science Of Advanced Materials, 6, Pp. 558 - 561.