1. New synthetic applications of the styrenes;Beets;Soap, Perfumery & Cosmetics,1956
2. M. G. J. Beets H. van Essen The reaction of α-methyl styrene with formaldehyde. Chemistry and Industry 1956 716 717
3. Molekulare Deutung sekundärer Dämpfungsmaxima. Bewegungen von Atomgruppen in Polymethacrylaten im Glaszustand;Heyboer;Kolloid-Z.,1956
4. Linear Viscoelastic Behaviour of Isotropic Materials I. Transient measurements;Schwarzl;Kolloid-Z.,1956
5. F. Bergsma A. J. Staverman Bi-ionic potentials 61 1956