| 1. | ERGP report on core indicators for monitoring the European postal market [documento eletrónico] : 2018 / European Regulators Group for Postal ServicesData Publicação: 2018 Tema: Correios e Serviços Postais |  | |
| 2. | Report on the measurement and the allocation of delivery costs in the universal service postal network [documento eletrónico] / European Regulators Group for Postal ServicesData Publicação: 2018 Tema: Correios e Serviços Postais | | |