1. The topology of quadratic mappings and Hessians of smooth mappings;Agrachëv,1988
2. Quadratic mappings and smooth vector functions: Euler characteristics of level sets;Agrachëv,1989
3. The structure of 1-dimensional surfaces with degenerate second quadratic form in n-dimensional Euclidean space;Borisenko;Ukr. Geom. Sb.,1973
4. The structure of a continuous surface that contains a line;Borisenko;Ukr. Geom. Sb.,1973
5. Extrinsic geometry of strongly parabolic multidimensional submanifolds;Borisenko;Uspekhi Mat. Nauk,1997