1. Imamura, A., Aoki, Y., Maekawa, K.: A theoretical synthesis of polymers by using uniform localization of molecular orbitals: proposal of an elongation method. J. Chem. Phys. 95, 5419–5431 (1991)
2. Aoki, Y., Imamura, A.: Local density of states of aperiodic polymers using the localized orbitals from an ab initio elongation method. J. Chem. Phys. 97, 8432–8440 (1992)
3. Aoki, Y., Suhai, S., Imamura, A.: An efficient cluster elongation method in density functional theory and its application to poly-hydrogen-bonding molecules. J. Chem. Phys. 101, 10808–10823 (1994)
4. Makowski, M., Korchowiec, J., Gu, F.L., Aoki, Y.: Describing electron correlation effects in the framework of the elongation method -Elongation-MP2: formalism, implementation and efficiency. J. Comput. Chem. 31, 1733–1740 (2010)
5. Gu, F.L., Imamura, A., Aoki, Y.: Elongation method for polymers and its application to nonlinear optics, in atoms, molecules and clusters in electric fields: theoretical approaches to the calculation of electric polarizabilities. In: Maroulis, G. (ed.) Computational Numerical and Mathematical Methods in Sciences and Engineering, vol. 1, pp. 97–177. Imperial College Press, London (2006)