1. Bruker, (2000). XSCANS. Bruker AXS Inc., Madison, Wisconsin, USA.
2. On enantiomorph-polarity estimation
3. Hughes, J. L. & Liu, R. C. H. (1976). US Patent No. 4 000 279.
4. Urea, thiourea and guanidine derivatives as multifunctional fuel stabilisers
5. Knhla, D. E., Studt, W. L., Campbell, H. F. & Yelnosky, J. (1986). US Patent No. 4 563 460.