KOBUS, Ryszard; RAUDSZUS, Frank. Evolution of Measurement of the Single Piece Mail Transit Time. Journal of Telecommunications and Information Technology, Warsaw, Poland, v. 70, n. 4, p. 109–114, 2017. DOI: 10.26636/jtit.2017.110717. Disponível em: https://www.jtit.pl/jtit/article/view/695. Acesso em: 3 aug. 2026.