1. The determination of soap in refined oil;Boekenoogen;Oil and Soap,1941
2. Zur Ableitung eines “mittleren Orientierungswinkels” aus dem Röntgendiagramm;de Booys;Kolloid-Z.,1941
3. On the leadbismuth line in Indonesians and their histiochemical identification;Breijer;Acta Leidensia (edita cura et sumptibus Scholae Medicinae Tropicae),1940-1941
4. On the influence of the concentration of a suspension upon the sedimentation velocity (in particular for a suspension of spherical particles);Burgers;Proc. Akad. Wetenschappen Amsterdam.,1942
5. The absorbtion spectra of zincsulphide and willemite;Gisolf;Proc. Akad. Wetenschappen Amsterdam.,1941