United States. War Department, Dictionary of Spoken Russian — §19… (1945)
“ The pronominal adjective некий "some," "a kind of" is used only in writing and in bookish speech. It has some forms from a stem [njek-] , some from a stem [njekoy-] , and the Pn некий from a stem [njekjiy-] : Mn некий, g некоего, d некоему, i неким or некоим, l некоем; Nn некое ”
