Pyroelectric luminescence via internal Poole-Frenkel effect A. Ruediger, O. F. Schirmer, A. K. Kadashchuk and Yu. A. Skryshevskii Europhys. Lett., 57 4 (2002) 592-596 Published online: 01 September 2002 DOI: 10.1209/epl/i2002-00502-1