. "1992-05-02Z"^^ . "1897-01-27Z"^^ . . . "1992Z"^^ . . . "Dr. Sergei Alexander Schelkunoff (January 27, 1897 - May 2, 1992), who published as S. A. Schelkunoff, was a distinguished mathematician and electromagnetism theorist who made noted contributions to antenna theory."@en . "American scientist" . "1897Z"^^ . "Schelkunoff, Sergei Alexander"@en . . . . . "Sergei Alexander Schelkunoff"@en .