1. Animal & Plant Health Agency (APHA), 2020. Explanatory guide to the seed potato classification scheme and approved stock scheme 2020/21. APHA, Powys, United Kingdom, 21 pp. Available at: https://tinyurl.com/4nk4z9v5.
2. European Commission (EC), 2008. Council Directive 2008/72/EC of 15 July 2008 on the marketing of vegetable propagating and planting material, other than seed. Official Journal of the European Union L205: 28-39. Available at: http://data.europa.eu/eli/dir/2008/72/oj.
3. European Commission (EC), 2017. Commission Implementing Decision (EU) 2017/547 of 21 March 2017 on the organisation of a temporary experiment under Council Directive 2002/56/EC as regards seed potato tubers derived from true potato seed. Official Journal of the European Union L78: 65-73. Available at: http://data.europa.eu/eli/dec_impl/2017/547/oj.
4. European Commission (EC), 2019a. Commission Delegated Regulation (EU) 2019/829 of 14 March 2019 supplementing Regulation (EU) 2016/2031 of the European Parliament and of the Council on protective measures against pests of plants, authorising Member States to provide for temporary derogations in view of official testing, scientific or educational purposes, trials, varietal selections, or breeding. Official Journal of the European Union L137: 15-25. Available at: http://data.europa.eu/eli/reg_del/2019/829/oj.
5. European Commission (EC), 2019b. Commission Implementing Regulation (EU) 2019/2072 of 28 November 2019 establishing uniform conditions for the implementation of Regulation (EU) 2016/2031 of the European Parliament and the Council, as regards protective measures against pests of plants. Official Journal of the European Union L319: 1-279. Available at: http://data.europa.eu/eli/reg_impl/2019/2072/oj.