@techreport{core85-editor,
	title       = {Extending the {Flex} graphics editor:
	               an object oriented approach},
	author      = {Core, Peter W and Foster, J Michael},
	series      = {RSRE Memorandum},
	institution = {Royal Signals and Radar Establishment, Malvern},
	publisher   = {Ministry of Defence},
	year        = {1985},
	note        = {(in preparation)},
	% TODO: no local copy
}