C. M. C. Castilho Universidade Federal da Bahia, Brazil,F. Brito Mota Universidade Federal da Bahia, Brazil,F. Borondo Universidad Autónoma de Madrid, Field emission properties of an array of pyramidal structures. JOURNAL OF PHYSICS D-APPLIED PHYSICS 42, 195303-1-195303-6 (2009). DOI: 10.1088/0022-3727/42/19/195303