1.		A study into factors influencing postal services and methods for forecasting traffic / European Conference of Postal and Telecommunications Administrations Data Publicação: [1989] Tema: Comunicações Eletrónicas
2.		Minutes of the fourth meeting of subgroup RR3 / European Conference of Postal and Telecommunications Administrations Data Publicação: 1989 Tema: Vária
3.		Meeting in Copenhagen, 30 May - 1 June 1989 : draft agenda / European Conference of Postal and Telecommunications Administrations Data Publicação: 1989 Tema: Vária