PACS:07.79.−v DOI:10.1070/PU1998v041n07ABEH000421 URL: https://ufn.ru/en/articles/1998/7/f/ 000075638400006 Citation: Zhdanov G S, Libenson M N, Martsinovskii G A "Optics in the diffraction limit: principles, results, and problems" Phys. Usp.41 719–722 (1998)