External links European Patent Convention, Part V, Opposition and Limitation Procedure (Art. 99 to 105) : Guidelines for Opposition and Limitation/Revocation Procedures : "Opposition procedure" Special edition 1/2010, Ancillary Regulations to the European Patent Convention (PDF, 1.9 MB), section d.4: "Opposition" (pp. 73–74). Notice from the EPO concerning the opposition procedure as from 1 July 2016, Official Journal 2016, A42 European Patent Organisation