| Medizintechnik und Informationstechnologie, Band II | Obituary: Professor Harold Hopkins, FRS, The Times, 3 Nov 1994 |
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| Siegler AM, Kemmann E 1975 |
Light conductor, an invention for examining internal parts and diseases, together with illustrations , Journal der practischen Arzneykunde und Wundarzneykunst Journal of Practical Medicine and Surgery , 24 : 107-124.