Quellen:
[1] BGH NZG 2014, 389; BGH NJW 1954, 1159; RGZ 130, 142; 136; Tank NJW 1969, 6, 8; Staudinger-BGB/Looschelders/Olzen, Berlin 2009, § 242 Rn. 518; Staudinger/Eberhard Schilken (2014) BGB § 167, Rn. 93.