1. Planck, M. (1915). Das Prinzip der kleinstenWirkung DieKultur der Gegenwart, 1, Physik. (Cited in reference to translation of “Least Action Principle” In: “Variational Principles in Mechanics”, p.p. 580–588. Moscow, Gosudarstvennoe Izdatelstvo Fiziko-Matematicheskoy Literatury Publishing House (1959)).
2. Gorbatenko, M. V., Pushkin, A. V. (1984). Voprosy Atomnoy Nauki i Tekhniki, Series: Teor. i Prikl. Fizika, No. 2/2, 40 [In Russian]. “In the Intermissions...” Collected works on research into the essentials of theoretical physics in Russian Federal Nuclear Center Arzamas-16. Editor Yu.A. Trutnev. World Scientific, p.p. 54–62 (1998).
3. Utiyama, R. (1954). Phys. Rev. 101, 1597.
4. Ivanenko, D. D., Pronin, P. I., Sardanashvili, G. A. Gauge Theory of Gravitation. Moscow State University Publishing House, Moscow (1985) [In Russian].
5. Fairchild, E. (1977). Phys. Rev. D16, 2438.