1. Pr. Jumpasut, Rubber World 254 (1), 14 (2016).
2. Worldwide Rubber Statistics, Ed. By J. L. McGraw (Int. Inst. Synth. Rubber Prod., Houston, 2014).
3. Bible, the Book of Genesis, Chap.41.
4. T. Saito, S. Nakaie, M. Kinoshita, T. Ihara, Sh. Kinugasa, A. Nomura, and T. S. Maeda, Metrologia 41 (3), 213 (2004).
5. E. Alvarado, Practical guide for quantitative 1D NMR integration, University of Michigan. http://www.umich.edu/~chemnmr/docs/Quantitative_ NMR.pdf. Cited 2010.