2 citations to https://www.mathnet.ru/rus/tm4228

1. A. V. Arutyunov, S. E. Zhukovskiy, “On stability of the generalized saddle points”, Optimization, 2024, 1  
2. A. V. Arutyunov, K. I. Salikhova, “The implicit function theorem in the neighborhood of an abnormal point”, Moscow Univ. Comput. Math. Cybern., 47:3 (2023), 115