VORGUL, Irena Yu.; MARCINIAK, Marian. Recent advances in PBG structures. Journal of Telecommunications and Information Technology, Warsaw, Poland, v. 1, n. 1-2, p. 71–76, 2000. DOI: 10.26636/jtit.2000.1-2.9. Disponível em: https://jtit.pl/jtit/article/view/9. Acesso em: 9 sep. 2026.