1. A. S. Davydov, Theory of the Atomic Nucleus (Gos. Izd. Fiz.-Mat. Liter., Moscow, 1958) [in Russian].
2. A. M. Demidov, L. I. Govor, V. A. Kurkin, and I. V. Mikhailov, Yad. Fiz. 69, 1205 (2006) [Phys. At. Nucl. 69, 1173 (2006)].
3. A. M. Demidov, L. I. Govor, V. A. Kurkin, and I. V. Mikhailov, Yad. Fiz. 70, 254 (2007) [Phys. At. Nucl. 70, 231 (2007)].
4. E. P. Grigoriev and V. G. Soloviev, Structure of Even Deformed Nuclei (Nauka, Moscow, 1974) [in Russian].
5. V. G. Soloviev, A. V. Sushkov, and N. Yu. Shirikova, Fiz. Élem. Chastits At. Yadra 27, 1643 (1996) [Phys. Part. Nucl. 27, 667 (1996)].