PACS:42.79.−e, 01.30.Cc (all) DOI:10.1070/PU1990v033n01ABEH002408 URL: https://ufn.ru/en/articles/1990/1/f/ Citation: Braginskii V B, Il’chenko V S, Gorodetskii M L "Optical microresonators with modes of the whispering gallery type" Sov. Phys. Usp.33 (1) 87–88 (1990)