@techreport{tombs91-evolution,
	author      = {Tombs, D J and Bruce, D I},
	title       = {The evolution of {Ten15}},
	series      = {RSRE Memorandum},
	institution = {Royal Signals and Radar Establishment, Malvern},
	publisher   = {Ministry of Defence},
	number      = {4543},
	month       = {11},
	year        = {1991},
	file        = {Tombs91-evolution.pdf},
}