DE: ECJ 14 Feb. 1995, Case C-279/93, Schumacker, ECLI:EU:C:1995:31. Other landmark decisions rendered by the ECJ in context of the development of the Schumacker
doctrine are: NL: ECJ, 11 Aug. 1995, Case C-80/94, Wielockx, ECLI:EU:C:1995:271; DE: ECJ, 14 Sept. 1999, Case C-391/97, Gschwind, ECLI:EU:C:1999:409; NL: ECJ,
12 Dec. 2002, Case C-385/00, De Groot, ECLI:EU:C:2002:750; SE: ECJ, 1 July 2003, Case C-169/03, Wallentin, ECLI:EU:C:2004:403; NL: ECJ, 16 Oct. 2008, Case C527/06, Renneberg, ECLI:EU:C:2008:566; DE: ECJ, 28 Feb. 2013, Case C-425/11, Ettwein, ECLI:EU:C:2013:121; BE: ECJ, 12 Dec. 2013, Case C-303/12, Imfeld and Garcet,
ECLI:EU:C:2013:822; NL: ECJ, 18 June 2015, Case C-9/14, Kieback, ECLI:EU:C:2015:406; NL: ECJ, 9 Feb. 2017, Case C-283/15, X v. Staatssecretaris van Financiën, ECLI:
EU:C:2017:102. Besides the ECJ case law, the doctrine has also found a formulation in the (non-binding) European Commission, Commission Recommendation 94/79/EC of 21