1. Bülau, H.C., 1999. Zum Aufreinigungspotential pastillierter Schmelzen. Ph.D. Thesis, University of Bremen, Shaker Verlag, Aachen.
2. Bülau, H.C., Ulrich, J., 1999. Sweating and washing of polycrystalline particles. Proceedings of the 14th International Symposium on Industrial Crystallization, Cambridge.
3. Chianese, A., Cipiriani, P., Parisi, M., 1999. An effective dry-sweating technique to purify organic compounds. Proceedings of the 14th International Symposium on Industrial Crystallization, Cambridge.
4. Daubert, T.E., Danner, R.P., 1989. Physical and Thermodynamic Properties of Pure Chemicals: Data Compilation, Vol. 3. Hemisphere, New York.
5. DSM, 1989. Caprolactam product information brochure, DSM Caprolactam Europe, Sittard, The Netherlands.