1. Kreyszig, E.(1999) Probability and statistics. In Advanced Engineering Mathematics, 8th ed.. ( pp. 1049 - 1153 ). New York : John Wiley & Sons. Part G
2. Owen, K.(1989) Diesel fuel additives influencing flow and storage properties. In Gasoline and Diesel Fuel Additives. ( pp. 105 - 125 ). Chichester : The Society of Chemical Industry.
3. (1983) Research Institute of Petroleum Processing. Determination of n-par-affin's content in kerosene and diesel by urea adduction. In Compilation of Analysis Method for Petrochemical. ( pp. 41 - 43 ). Beijing : Petroleum Industry Publishing House.