A Study of Billing Schemes in an Experimental Next Generation Network. - Priscila Solís Barreto; Georges Amvame-Nze; Cristian Vidal Silva; Juliana Santos Sombra Oliveira; Paulo Henrique Portela de Carvalho; Humberto Abdalla Jr.; Antonio José Martins Soares; Ricardo Staciarini Puttini (ICN (2), 2005)