1. S. L. Ziglin, “Branching of solutions and nonexistence of first integrals in Hamiltonian mechanics. II,” Funkts. Anal. Prilozhen.,17, No. 1, 8–23 (1983).
2. S. L. Ziglin, “On the absence of an additional first integral in a problem of rigid body dynamics,” Dokl. Akad Nauk SSSR,292, No. 4, 804–807 (1987).
3. S. L. Ziglin, “Splitting of separatrices, branching of solutions, and nonexistence of an integral in rigid body dynamics,” Trudy Mosk. Mat. Obshch.,41, 287–303 (1980).
4. S. L. Ziglin, “Splitting of separatrices and the nonexistence of first integrals in Hamilton type systems of differential equations with two degrees of freedom,” Izv. Akad. Nauk SSSR, Ser. Mat.,51, No. 5, 1088–1103 (1987).
5. V. V. Kozlov and D. V. Treshchev, “Nonintegrability of the general problem on the rotation of a dynamically symmetric heavy rigid body with a fixed point. I,” Vestn. Mosk. Univ., Ser. 1, Mat. Mekh., No. 6, 73–81 (1985).