- Gianmarco Capitanio, “Simple tangential family germs and perestroikas of their envelopes”, Bulletin des Sciences Mathématiques, 130, № 1, 2006, 1
- A. F. Zakharov, 406, Gravitational Lenses, 1992, 386
- Mostafa Salarinoghabi, “On vertices and evolute of orthogonal projection of space curves”, Topology and its Applications, 234, 2018, 269
- J. W. Bruce, “Wavefronts and parallels in Euclidean space”, Math. Proc. Camb. Phil. Soc., 93, № 2, 1983, 323
- Yury A. Kravtsov, Yuri Ilich Orlov, 6, Geometrical Optics of Inhomogeneous Media, 1990, 3
- S. I. Agafonov, “On Implicit ODEs with Hexagonal Web of Solutions”, J Geom Anal, 19, № 3, 2009, 481
- Y. M. Eliashberg, N. M. Mishachev, Essays in Mathematics and its Applications, 2012, 81
- Klaus Jänich, “Symmetry properties of singularities ofC
∞-functions”, Math. Ann., 238, № 2, 1978, 147
- MARCOS A. G. GARCÍA, ALEXANDER V. TURBINER, “THE QUANTUM H3 INTEGRABLE SYSTEM”, Int. J. Mod. Phys. A, 25, № 30, 2010, 5567
- V.I. Arnold, Theoretical and Applied Mechanics, 1989, 1