Cauer, Emil; Mathis, Wolfgang; and Pauli, Rainer; "Life and Work of Wilhelm Cauer (1900 – 1945)", Proceedings of the Fourteenth International Symposium of Mathematical Theory of Networks and Systems (MTNS2000), p4, Perpignan, June, 2000. Retrieved online 19 September 2008.
See for ex. the British standard BS 7925-2 (Software component testing), or its 2001 work draft, BCS SIGIST (British Computer Society Specialist Interest Group in Software Testing), "Standard for Software Component Testing", Working Draft 3.4, 27 April 2001 webpage.