1. Aktieselskabet Cuzco v. The Sucarseco; 294 U.S. 394, 55 S.ct. 467.
2. Hart, H. L. and Honoré, A. M.: 1959, Causation in the Law, Oxford University Press, Oxford.
3. Mossey v. Mueller, 218 N. W. 2nd 514 (Wisconsin Supreme Court, June 4, 1974).
4. U.S. v. Rabinowich, 238 U.S. 78, 35 S.ct. 682.