Dielectric spectroscopic evidence of formation of peculiar space-charge regions in lead oxyfluoroborate glasses during evolution to 'beta'-Pb'F IND. 2' electrocrystallization - Souza, José Ezequiel de; Hernandes, Antônio Carlos; M'Peko, Jean-Claude (Encontro Nacional de Física da Matéria Condensada, 2012)