O. E. . Hentosh, Y. A. . Prykarpatskyy, A. A. . Balinsky, and A. K. . Prykarpatski, “Geometric structures on the orbits of loop diffeomorphism groups and related ‘heavenly-type’ hamiltonian systems. II”, Ukr. Mat. Zhurn., vol. 74, no. 9, pp. 1182–1200, Nov. 2022, doi: 10.37863/umzh.v74i9.7234.