PACS:01.10.Fv DOI:10.1070/PU1977v020n07ABEH005451 URL: https://ufn.ru/en/articles/1977/7/h/ Citation: Abroyan I A, Korablev V V, Petrov N N, Titov A I "Secondary-Emission Methods of Investigating the Structure and Composition of the Surface Layers of Solids" Sov. Phys. Usp.20 640–642 (1977)