1. H. van Hoorn P. Bruin Determination of the modulus of elasticity in the study of paint films 1959 47 49
2. Measurement of the resistivity constants of anisotropic conductors by means of Plane-Parallel discs of arbitrary shape;Hornstra;J. Electronis and Control,1959
3. The effect of paramagnetic substances on the conversion of some pyrimidines by ultraviolet radiation;Beukers;Biochim. Biophys. Acta,1960
4. On the mechanism of a photodynamic reaction;Zondag;Biochim. Biophys. Acta,1960
5. Thermodynamics and formulation of reactions involving imperfections in solids;Kröger;Philips Research Repts,1959