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2.
Karpe, G.: The Basis of Clinical Electroretinography. Acta Ophthalm. suppl.XXIV, 1945.
3.
Henkes, H.E. : Electroretinogram in circulatory disturbances of the retina IV. The ERG in cases of retinal and choroidal hypertension and arteriosclerosis. AMA Arch. of Ophthalm. (accepted for public.)
4.
Henkes, H.E. ; J.P. Van Der Kam AND A.J. Sandifort Westhoff: Electroretinographic studies in arterial hypertension. The effect of reduction in blood pressure on the electrical response of the human retina. (to be published in AMA Arch. of Ophthalm.)