[3]International Civil Aviation Organization (ICAO): Manual on implementation of a 300 m (1,000 ft) vertical separation minimum between FL290 and FL410 inclusive, Doc9574/AN934, ICAO, 2002.
[4]International Civil Aviation Organization (ICAO): Manual of operating procedures and practices for regional monitoring agencies in relation to the use of a 300m(1000ft) vertical separation minimum above FL290, Doc9937/AN474, ICAO, 2004.