1. Hooker, Stanley, J., Not Much of an Engineer, Airlife Publishing imprintof The Crowwood Press Ltd, Ramsbury, Marlborough Wiltshire SN8 2HR,2002, Chap. 7, pp.136-137.
2. Federal Aviation Administration, DOT, Airworthiness Directive 99-15-06, Federal Registrar, Vol. 64, No. 137, Monday July , 19, 1999, Rules and Regulations, pp. 38557-38560.
3. The Ice Particle Threat to Engines in Flight