Magnetic resonance study of a vanadium pentoxide gel - Nascimento, Otaciro Rangel; Magon, Claudio José; Lima, José Fernando de; Donoso, José Pedro; Benavente, Eglantina; Paez, Jaime; Lavayen, Vladimir; Santa Ana, Maria Angelica; Gonzalez, Guillermo (Journal of Sol-Gel Science and Technology, 2008)