1. Đào Trong Thi. Minimal real currents on compact Riemannian manifolds. Izv. Akad. Nauk. SSSR, Ser. Math.-1977, t.41, N 4, p.853–867.
2. Đào Trong Thi, Fomenko A.T. Minimal surfaces and the Plateau's problem, Moscow, Nauka, 1987.
3. Dynkin E.B. Topological characteristics of homomorphisms of Lie compact groups, Mat. sbornik.-1954, 35, N 1, p.129–173.
4. Kobayshi S., Nomizu K. Foundation of differential geometry, Intersci. Publishers, New York-London, 1969.
5. Le Hong Van. Absolutely minimal surfaces and gauges in adjoint orbits of classical Lie groups, Dokl. Akad. Nauk, 1988,-298, N 6, p.1308–1311.