1. Gordon, D. (1958) Echoencephalographie.Rev. neurol., Paris 99, 652–653.
2. Gordon, D. (1959) Echoencephalography.Br. Med. J. i, 1500–1504.
3. Gordon, D. (1967–68) Personal communications.
4. Jeppsson, S. (1961) Echoencephalography IV. The midline echo: an evaluation of its usefulness for diagnosing intracranial expansivities and an investigation into its sources.Acta chir. scand. Suppl. 272, 1–151.
5. Jeppsson, S. (1962) Echoencephalography III. Further studies on the sources of the midline echo and a clinical evaluation.Acta chir. scand. 119, 455–462.