2 citations to https://www.mathnet.ru/rus/sm1081

1. M. A. Lohe, “Systems of matrix Riccati equations, linear fractional transformations, partial integrability and synchronization”, Journal of Mathematical Physics, 60:7 (2019)  
2. Paiva J.C.A., Duran C.E., “Geometric Invariants of Fanning Curves”, Adv. Appl. Math., 42:3 (2009), 290–312