PACS:42.65.Jx, 78.20.Nv, 78.20.Ci, 51.70.+f (all) DOI:10.1070/PU1970v013n02ABEH004241 URL: https://ufn.ru/en/articles/1970/2/m/ Citation: Askar’yan G A, Studenov V B, Chistyi I L "Thermal Self-focusing in a Beam with Decreasing Intensity Near the Axis ('Banana' Self-focusing)" Sov. Phys. Usp.13 295–296 (1970)