1. Electret domains in individual trioxane polycrystals
2. Van der Heijde, H. B., van de Craats, F. P., van Kasteren, P. H. G. and de Wit, A. 1965.Reactivity of Solids, Edited by: Schwab, G. M. 164Amsterdam: Elsevier. 5th Intern. Symposium, Munich, 1964
3. Nauta, H. 1965.Reactivity of Solids, Edited by: Schwab, G. M. 151Amsterdam: Elsevier. 5th Intern. Symposium, Munich, 1964
4. In addition, the reader is referred to the following recent papers on the subject