1. Tang Aoqing, Jiang Yuansheng, Dai Shushan et al., The Molecular Orbital Graph Theory, Beijing: Science Press, 1980, 197–201.
2. Zhao Honggang, Hu Shixian, Li Jiping et al., Applications of the molecular orbital graph theory:two topological methods of evaluating μL, Science in China, Ser. B, 1993, 36(8): 804.
3. Graovac, A., Babic, D., The evaluation of quantum chemical indices by the method of moments, J. Quant. Chem. Sym., 1990, (24): 221.
4. Jiang Yuansheng, Tang Aoqing, Hoffman, R., Evaluation of moments and their application in Hückel molecular orbital theory, Theor. Chim. Acta, 1984, 66: 183.
5. George, G H., The evaluation of moments for polycyclic hydrocarbons, Theor. Chim. Acta., 1986, 70: 323.