LongdonN. and GuyenneG., Editors. Europe: two decades in space. 1964–1984. Recollections of the principal pioneers. esaScientific and Technical Publication Branch, estec, Noordwijk, The Netherlands, 1984.
2.
MichaelisA.R., Partners into Space. Case for Pooling Resources. Letter toThe Times, London, 14 August1958.
3.
Many ESA publications are available free from: esa Scientific and Technical Publication Branch, estec, pob 299, 2200 AG Noordwijk, The Netherlands.
