Stegantseva, P., & Grechneva, M. (2024). Two-dimensional nonisotropic surfaces with flat normal connection and a nondegenerate Grassmann image of constant curvature in the Minkowski space. Ukrains’kyi Matematychnyi Zhurnal, 76(4), 533-551. https://doi.org/10.3842/umzh.v74i4.6743