by Prof. A. E. Dolbear. by Prof. Dr. Georg Goubau. by Prof. A.K. Kamal. by Prof. C. H. Reilly. by Prof. G. Hamabe. by Prof. Ir. J. J. Broeze. by Prof. Dr. D. N. Ghorafas. by C. C. Goodyear. by Prof. Alex. Hogg. by Prof. Sigm. Freud.